diff --git a/backend/src/application.rs b/backend/src/application.rs
index 00c5b52deb..81518fd9dc 100644
--- a/backend/src/application.rs
+++ b/backend/src/application.rs
@@ -57,6 +57,7 @@ pub fn run(listener: TcpListener, app_ctx: AppContext) -> Result<Server, std::io
             .app_data(app_ctx.persistence.clone())
             .app_data(Data::new(app_ctx.persistence.pg_pool()))
             .app_data(app_ctx.ws_receivers.clone())
+            .app_data(app_ctx.document_manager.clone())
     })
     .listen(listener)?
     .run();
diff --git a/backend/src/context.rs b/backend/src/context.rs
index 21207e40b1..9c6a3dead1 100644
--- a/backend/src/context.rs
+++ b/backend/src/context.rs
@@ -5,7 +5,11 @@ use crate::services::{
 use actix::Addr;
 use actix_web::web::Data;
 
-use crate::services::document::{persistence::DocumentKVPersistence, ws_receiver::make_document_ws_receiver};
+use crate::services::document::{
+    persistence::DocumentKVPersistence,
+    ws_receiver::{make_document_ws_receiver, DocumentPersistenceImpl},
+};
+use flowy_collaboration::sync::ServerDocumentManager;
 use lib_ws::WSModule;
 use sqlx::PgPool;
 use std::sync::Arc;
@@ -15,6 +19,7 @@ pub struct AppContext {
     pub ws_server: Data<Addr<WSServer>>,
     pub persistence: Data<Arc<FlowyPersistence>>,
     pub ws_receivers: Data<WebSocketReceivers>,
+    pub document_manager: Data<Arc<ServerDocumentManager>>,
 }
 
 impl AppContext {
@@ -25,12 +30,16 @@ impl AppContext {
         let kv_store = make_document_kv_store(pg_pool.clone());
         let persistence = Arc::new(FlowyPersistence { pg_pool, kv_store });
 
-        let document_ws_receiver = make_document_ws_receiver(persistence.clone());
+        let document_persistence = Arc::new(DocumentPersistenceImpl(persistence.clone()));
+        let document_manager = Arc::new(ServerDocumentManager::new(document_persistence));
+
+        let document_ws_receiver = make_document_ws_receiver(persistence.clone(), document_manager.clone());
         ws_receivers.set(WSModule::Doc, document_ws_receiver);
         AppContext {
             ws_server,
             persistence: Data::new(persistence),
             ws_receivers: Data::new(ws_receivers),
+            document_manager: Data::new(document_manager),
         }
     }
 }
diff --git a/backend/src/services/document/persistence.rs b/backend/src/services/document/persistence.rs
index a48779f63b..006df85b60 100644
--- a/backend/src/services/document/persistence.rs
+++ b/backend/src/services/document/persistence.rs
@@ -15,7 +15,9 @@ use flowy_collaboration::protobuf::{
 };
 use lib_ot::{core::OperationTransformable, rich_text::RichTextDelta};
 use protobuf::Message;
+use std::convert::TryInto;
 
+use flowy_collaboration::sync::ServerDocumentManager;
 use std::sync::Arc;
 use uuid::Uuid;
 
@@ -39,23 +41,23 @@ pub async fn read_document(
     make_doc_from_revisions(&params.doc_id, revisions)
 }
 
-#[tracing::instrument(level = "debug", skip(kv_store, params), fields(delta), err)]
+#[tracing::instrument(level = "debug", skip(document_manager, params), fields(delta), err)]
 pub async fn reset_document(
-    kv_store: &Arc<DocumentKVPersistence>,
+    document_manager: &Arc<ServerDocumentManager>,
     mut params: ResetDocumentParams,
 ) -> Result<(), ServerError> {
-    let revisions = params.take_revisions().take_items();
-    let doc_id = params.take_doc_id();
-    kv_store
-        .transaction(|mut transaction| {
-            Box::pin(async move {
-                let _ = transaction.batch_delete_key_start_with(&doc_id).await?;
-                let items = revisions_to_key_value_items(revisions.into())?;
-                let _ = transaction.batch_set(items).await?;
-                Ok(())
-            })
-        })
+    let params: flowy_collaboration::entities::doc::ResetDocumentParams = (&mut params).try_into().unwrap();
+    let mut revisions = params.revisions.into_inner();
+    if revisions.is_empty() {
+        return Err(ServerError::payload_none().context("Revisions should not be empty when reset the document"));
+    }
+    let doc_id = params.doc_id.clone();
+    revisions.sort_by(|a, b| a.rev_id.cmp(&b.rev_id));
+    let _ = document_manager
+        .handle_document_reset(&doc_id, revisions)
         .await
+        .map_err(internal_error)?;
+    Ok(())
 }
 
 #[tracing::instrument(level = "debug", skip(kv_store), err)]
@@ -152,7 +154,7 @@ impl DocumentKVPersistence {
 }
 
 #[inline]
-fn revisions_to_key_value_items(revisions: Vec<Revision>) -> Result<Vec<KeyValue>, ServerError> {
+pub fn revisions_to_key_value_items(revisions: Vec<Revision>) -> Result<Vec<KeyValue>, ServerError> {
     let mut items = vec![];
     for revision in revisions {
         let key = make_revision_key(&revision.doc_id, revision.rev_id);
@@ -193,7 +195,7 @@ fn make_doc_from_revisions(doc_id: &str, mut revisions: RepeatedRevision) -> Res
     let mut document_delta = RichTextDelta::new();
     let mut base_rev_id = 0;
     let mut rev_id = 0;
-    // TODO: generate delta from revision should be wrapped into function.
+    // TODO: replace with make_delta_from_revisions
     for revision in revisions {
         base_rev_id = revision.base_rev_id;
         rev_id = revision.rev_id;
diff --git a/backend/src/services/document/router.rs b/backend/src/services/document/router.rs
index 69e74df086..dfd2cda1ca 100644
--- a/backend/src/services/document/router.rs
+++ b/backend/src/services/document/router.rs
@@ -10,6 +10,7 @@ use actix_web::{
 use backend_service::{errors::ServerError, response::FlowyResponse};
 use flowy_collaboration::protobuf::{CreateDocParams, DocumentId, ResetDocumentParams};
 
+use flowy_collaboration::sync::ServerDocumentManager;
 use std::sync::Arc;
 
 pub async fn create_document_handler(
@@ -36,10 +37,9 @@ pub async fn read_document_handler(
 
 pub async fn reset_document_handler(
     payload: Payload,
-    persistence: Data<Arc<FlowyPersistence>>,
+    document_manager: Data<Arc<ServerDocumentManager>>,
 ) -> Result<HttpResponse, ServerError> {
     let params: ResetDocumentParams = parse_from_payload(payload).await?;
-    let kv_store = persistence.kv_store();
-    let _ = reset_document(&kv_store, params).await?;
+    let _ = reset_document(document_manager.get_ref(), params).await?;
     Ok(FlowyResponse::success().into())
 }
diff --git a/backend/src/services/document/ws_receiver.rs b/backend/src/services/document/ws_receiver.rs
index ca91596a82..1d6ecc0f77 100644
--- a/backend/src/services/document/ws_receiver.rs
+++ b/backend/src/services/document/ws_receiver.rs
@@ -6,7 +6,7 @@ use crate::services::{
     web_socket::{WSClientData, WebSocketReceiver},
 };
 
-use crate::context::FlowyPersistence;
+use crate::{context::FlowyPersistence, services::document::persistence::revisions_to_key_value_items};
 use backend_service::errors::ServerError;
 use flowy_collaboration::{
     entities::{
@@ -25,10 +25,10 @@ use std::{
 };
 use tokio::sync::{mpsc, oneshot};
 
-pub fn make_document_ws_receiver(persistence: Arc<FlowyPersistence>) -> Arc<DocumentWebSocketReceiver> {
-    let document_persistence = Arc::new(DocumentPersistenceImpl(persistence.clone()));
-    let document_manager = Arc::new(ServerDocumentManager::new(document_persistence));
-
+pub fn make_document_ws_receiver(
+    persistence: Arc<FlowyPersistence>,
+    document_manager: Arc<ServerDocumentManager>,
+) -> Arc<DocumentWebSocketReceiver> {
     let (ws_sender, rx) = tokio::sync::mpsc::channel(100);
     let actor = DocumentWebSocketActor::new(rx, document_manager);
     tokio::task::spawn(actor.run());
@@ -72,7 +72,7 @@ impl WebSocketReceiver for DocumentWebSocketReceiver {
     }
 }
 
-struct DocumentPersistenceImpl(Arc<FlowyPersistence>);
+pub struct DocumentPersistenceImpl(pub Arc<FlowyPersistence>);
 impl Debug for DocumentPersistenceImpl {
     fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result { f.write_str("DocumentPersistenceImpl") }
 }
@@ -83,9 +83,9 @@ impl DocumentPersistence for DocumentPersistenceImpl {
             doc_id: doc_id.to_string(),
             ..Default::default()
         };
-        let persistence = self.0.kv_store();
+        let kv_store = self.0.kv_store();
         Box::pin(async move {
-            let mut pb_doc = read_document(&persistence, params)
+            let mut pb_doc = read_document(&kv_store, params)
                 .await
                 .map_err(server_error_to_collaborate_error)?;
             let doc = (&mut pb_doc)
@@ -136,6 +136,24 @@ impl DocumentPersistence for DocumentPersistenceImpl {
 
         Box::pin(async move { f().await.map_err(server_error_to_collaborate_error) })
     }
+
+    fn reset_document(&self, doc_id: &str, revisions: Vec<Revision>) -> BoxResultFuture<(), CollaborateError> {
+        let kv_store = self.0.kv_store();
+        let doc_id = doc_id.to_owned();
+        let f = || async move {
+            kv_store
+                .transaction(|mut transaction| {
+                    Box::pin(async move {
+                        let _ = transaction.batch_delete_key_start_with(&doc_id).await?;
+                        // let items = revisions_to_key_value_items(vec![])?;
+                        let _ = transaction.batch_set(vec![]).await?;
+                        Ok(())
+                    })
+                })
+                .await
+        };
+        Box::pin(async move { f().await.map_err(server_error_to_collaborate_error) })
+    }
 }
 
 fn server_error_to_collaborate_error(error: ServerError) -> CollaborateError {
diff --git a/backend/tests/document_test/edit_script.rs b/backend/tests/document_test/edit_script.rs
index a2501e025a..b966b940a9 100644
--- a/backend/tests/document_test/edit_script.rs
+++ b/backend/tests/document_test/edit_script.rs
@@ -14,8 +14,9 @@ use crate::util::helper::{spawn_server, TestServer};
 use flowy_collaboration::{entities::doc::DocumentId, protobuf::ResetDocumentParams};
 use lib_ot::rich_text::{RichTextAttribute, RichTextDelta};
 use parking_lot::RwLock;
-use backend::services::document::persistence::{DocumentKVPersistence, read_document, reset_document};
+use backend::services::document::persistence::{read_document, reset_document};
 use flowy_collaboration::entities::revision::{RepeatedRevision, Revision};
+use flowy_collaboration::sync::ServerDocumentManager;
 use lib_ot::core::Interval;
 
 use flowy_net::services::ws::FlowyWSConnect;
@@ -146,8 +147,8 @@ async fn run_scripts(context: Arc<RwLock<ScriptContext>>, scripts: Vec<DocScript
                         md5,
                     );
                     
-                    let kv_store = Data::new(context.read().server.app_ctx.persistence.kv_store());
-                    reset_doc(&doc_id, RepeatedRevision::new(vec![revision]), kv_store.get_ref()).await;
+                    let document_manager = context.read().server.app_ctx.document_manager.clone();
+                    reset_doc(&doc_id, RepeatedRevision::new(vec![revision]), document_manager.get_ref()).await;
                     sleep(Duration::from_millis(2000)).await;
                 },
                 // DocScript::Sleep(sec) => {
@@ -182,10 +183,10 @@ async fn create_doc(flowy_test: &FlowySDKTest) -> String {
     view_test.view.id
 }
 
-async fn reset_doc(doc_id: &str, repeated_revision: RepeatedRevision, kv_store: &Arc<DocumentKVPersistence>) {
+async fn reset_doc(doc_id: &str, repeated_revision: RepeatedRevision, document_manager: &Arc<ServerDocumentManager>) {
     let pb: flowy_collaboration::protobuf::RepeatedRevision = repeated_revision.try_into().unwrap();
     let mut params = ResetDocumentParams::new();
     params.set_doc_id(doc_id.to_owned());
     params.set_revisions(pb);
-    let _ = reset_document(kv_store, params).await.unwrap();
+    let _ = reset_document(document_manager, params).await.unwrap();
 }
diff --git a/frontend/rust-lib/flowy-document/src/services/doc/edit/queue.rs b/frontend/rust-lib/flowy-document/src/services/doc/edit/queue.rs
index 50e482b78d..8730318c30 100644
--- a/frontend/rust-lib/flowy-document/src/services/doc/edit/queue.rs
+++ b/frontend/rust-lib/flowy-document/src/services/doc/edit/queue.rs
@@ -4,6 +4,7 @@ use flowy_collaboration::{
     document::{history::UndoResult, Document, NewlineDoc},
     entities::revision::Revision,
     errors::CollaborateError,
+    util::make_delta_from_revisions,
 };
 use flowy_error::FlowyError;
 use futures::stream::StreamExt;
@@ -77,20 +78,7 @@ impl EditorCommandQueue {
             },
             EditorCommand::TransformRevision { revisions, ret } => {
                 let f = || async {
-                    let mut new_delta = RichTextDelta::new();
-                    for revision in revisions {
-                        match RichTextDelta::from_bytes(revision.delta_data) {
-                            Ok(delta) => {
-                                new_delta = new_delta.compose(&delta)?;
-                            },
-                            Err(e) => {
-                                let err_msg = format!("Deserialize remote revision failed: {:?}", e);
-                                log::error!("{}", err_msg);
-                                return Err(CollaborateError::internal().context(err_msg));
-                            },
-                        }
-                    }
-
+                    let new_delta = make_delta_from_revisions(revisions)?;
                     let read_guard = self.document.read().await;
                     let mut server_prime: Option<RichTextDelta> = None;
                     let client_prime: RichTextDelta;
diff --git a/frontend/rust-lib/flowy-document/src/services/doc/web_socket/web_socket.rs b/frontend/rust-lib/flowy-document/src/services/doc/web_socket/web_socket.rs
index 868f5e2d97..54dde7b901 100644
--- a/frontend/rust-lib/flowy-document/src/services/doc/web_socket/web_socket.rs
+++ b/frontend/rust-lib/flowy-document/src/services/doc/web_socket/web_socket.rs
@@ -19,7 +19,7 @@ use flowy_error::{internal_error, FlowyError, FlowyResult};
 use lib_infra::future::FutureResult;
 
 use crate::services::doc::web_socket::local_ws_impl::LocalWebSocketManager;
-use flowy_collaboration::entities::{revision::pair_rev_id_from_revisions, ws::DocumentServerWSDataType};
+use flowy_collaboration::entities::ws::DocumentServerWSDataType;
 use lib_ot::rich_text::RichTextDelta;
 use lib_ws::WSConnectState;
 use std::{collections::VecDeque, convert::TryFrom, sync::Arc};
diff --git a/frontend/rust-lib/flowy-virtual-net/src/mock/server.rs b/frontend/rust-lib/flowy-virtual-net/src/mock/server.rs
index 2550de42b3..e6fb33c6ad 100644
--- a/frontend/rust-lib/flowy-virtual-net/src/mock/server.rs
+++ b/frontend/rust-lib/flowy-virtual-net/src/mock/server.rs
@@ -94,6 +94,10 @@ impl DocumentPersistence for MockDocServerPersistence {
     }
 
     fn get_doc_revisions(&self, _doc_id: &str) -> BoxResultFuture<Vec<Revision>, CollaborateError> { unimplemented!() }
+
+    fn reset_document(&self, _doc_id: &str, _revisions: Vec<Revision>) -> BoxResultFuture<(), CollaborateError> {
+        unimplemented!()
+    }
 }
 
 #[derive(Debug)]
diff --git a/shared-lib/flowy-collaboration/src/entities/revision.rs b/shared-lib/flowy-collaboration/src/entities/revision.rs
index 9843bdc850..c973493e69 100644
--- a/shared-lib/flowy-collaboration/src/entities/revision.rs
+++ b/shared-lib/flowy-collaboration/src/entities/revision.rs
@@ -107,10 +107,9 @@ impl std::ops::DerefMut for RepeatedRevision {
 }
 
 impl RepeatedRevision {
-    pub fn new(items: Vec<Revision>) -> Self {
-        let mut sorted_items = items.clone();
-        sorted_items.sort_by(|a, b| a.rev_id.cmp(&b.rev_id));
-        Self { items: sorted_items }
+    pub fn new(mut items: Vec<Revision>) -> Self {
+        items.sort_by(|a, b| a.rev_id.cmp(&b.rev_id));
+        Self { items }
     }
 
     pub fn empty() -> Self { RepeatedRevision { items: vec![] } }
diff --git a/shared-lib/flowy-collaboration/src/sync/server.rs b/shared-lib/flowy-collaboration/src/sync/server.rs
index dbfbf9185f..03ce39054f 100644
--- a/shared-lib/flowy-collaboration/src/sync/server.rs
+++ b/shared-lib/flowy-collaboration/src/sync/server.rs
@@ -25,6 +25,7 @@ pub trait DocumentPersistence: Send + Sync + Debug {
     fn create_doc(&self, doc_id: &str, revisions: Vec<Revision>) -> BoxResultFuture<DocumentInfo, CollaborateError>;
     fn get_revisions(&self, doc_id: &str, rev_ids: Vec<i64>) -> BoxResultFuture<Vec<Revision>, CollaborateError>;
     fn get_doc_revisions(&self, doc_id: &str) -> BoxResultFuture<Vec<Revision>, CollaborateError>;
+    fn reset_document(&self, doc_id: &str, revisions: Vec<Revision>) -> BoxResultFuture<(), CollaborateError>;
 }
 
 pub struct ServerDocumentManager {
@@ -66,7 +67,7 @@ impl ServerDocumentManager {
                 Ok(())
             },
             Some(handler) => {
-                let _ = handler.apply_revisions(doc_id.clone(), user, revisions).await?;
+                let _ = handler.apply_revisions(user, revisions).await?;
                 Ok(())
             },
         };
@@ -86,14 +87,26 @@ impl ServerDocumentManager {
     ) -> Result<(), CollaborateError> {
         let rev_id = rev_id_from_str(&client_data.id)?;
         let doc_id = client_data.doc_id.clone();
-
         match self.get_document_handler(&doc_id).await {
             None => {
                 tracing::warn!("Document:{} doesn't exist, ignore pinging", doc_id);
                 Ok(())
             },
             Some(handler) => {
-                let _ = handler.apply_ping(doc_id.clone(), rev_id, user).await?;
+                let _ = handler.apply_ping(rev_id, user).await?;
+                Ok(())
+            },
+        }
+    }
+
+    pub async fn handle_document_reset(&self, doc_id: &str, revisions: Vec<Revision>) -> Result<(), CollaborateError> {
+        match self.get_document_handler(doc_id).await {
+            None => {
+                tracing::warn!("Document:{} doesn't exist, ignore document reset", doc_id);
+                Ok(())
+            },
+            Some(handler) => {
+                let _ = handler.apply_document_reset(revisions).await?;
                 Ok(())
             },
         }
@@ -167,7 +180,6 @@ impl OpenDocHandle {
     #[tracing::instrument(level = "debug", skip(self, user, revisions), err)]
     async fn apply_revisions(
         &self,
-        doc_id: String,
         user: Arc<dyn RevisionUser>,
         revisions: Vec<Revision>,
     ) -> Result<(), CollaborateError> {
@@ -175,7 +187,6 @@ impl OpenDocHandle {
         let persistence = self.persistence.clone();
         self.users.insert(user.user_id(), user.clone());
         let msg = DocumentCommand::ApplyRevisions {
-            doc_id,
             user,
             revisions,
             persistence,
@@ -187,17 +198,11 @@ impl OpenDocHandle {
     }
 
     #[tracing::instrument(level = "debug", skip(self, user), err)]
-    async fn apply_ping(
-        &self,
-        doc_id: String,
-        rev_id: i64,
-        user: Arc<dyn RevisionUser>,
-    ) -> Result<(), CollaborateError> {
+    async fn apply_ping(&self, rev_id: i64, user: Arc<dyn RevisionUser>) -> Result<(), CollaborateError> {
         let (ret, rx) = oneshot::channel();
         self.users.insert(user.user_id(), user.clone());
         let persistence = self.persistence.clone();
         let msg = DocumentCommand::Ping {
-            doc_id,
             user,
             persistence,
             rev_id,
@@ -207,6 +212,19 @@ impl OpenDocHandle {
         Ok(())
     }
 
+    #[tracing::instrument(level = "debug", skip(self, revisions), err)]
+    async fn apply_document_reset(&self, revisions: Vec<Revision>) -> Result<(), CollaborateError> {
+        let (ret, rx) = oneshot::channel();
+        let persistence = self.persistence.clone();
+        let msg = DocumentCommand::Reset {
+            persistence,
+            revisions,
+            ret,
+        };
+        let _ = self.send(msg, rx).await?;
+        Ok(())
+    }
+
     async fn send<T>(&self, msg: DocumentCommand, rx: oneshot::Receiver<T>) -> CollaborateResult<T> {
         let _ = self
             .sender
@@ -226,19 +244,22 @@ impl std::ops::Drop for OpenDocHandle {
 // #[derive(Debug)]
 enum DocumentCommand {
     ApplyRevisions {
-        doc_id: String,
         user: Arc<dyn RevisionUser>,
         revisions: Vec<Revision>,
         persistence: Arc<dyn DocumentPersistence>,
         ret: oneshot::Sender<CollaborateResult<()>>,
     },
     Ping {
-        doc_id: String,
         user: Arc<dyn RevisionUser>,
         persistence: Arc<dyn DocumentPersistence>,
         rev_id: i64,
         ret: oneshot::Sender<CollaborateResult<()>>,
     },
+    Reset {
+        persistence: Arc<dyn DocumentPersistence>,
+        revisions: Vec<Revision>,
+        ret: oneshot::Sender<CollaborateResult<()>>,
+    },
 }
 
 struct DocumentCommandQueue {
@@ -283,7 +304,6 @@ impl DocumentCommandQueue {
     async fn handle_message(&self, msg: DocumentCommand) {
         match msg {
             DocumentCommand::ApplyRevisions {
-                doc_id,
                 user,
                 revisions,
                 persistence,
@@ -291,13 +311,12 @@ impl DocumentCommandQueue {
             } => {
                 let result = self
                     .synchronizer
-                    .sync_revisions(doc_id, user, revisions, persistence)
+                    .sync_revisions(user, revisions, persistence)
                     .await
                     .map_err(internal_error);
                 let _ = ret.send(result);
             },
             DocumentCommand::Ping {
-                doc_id,
                 user,
                 persistence,
                 rev_id,
@@ -305,7 +324,19 @@ impl DocumentCommandQueue {
             } => {
                 let result = self
                     .synchronizer
-                    .pong(doc_id, user, persistence, rev_id)
+                    .pong(user, persistence, rev_id)
+                    .await
+                    .map_err(internal_error);
+                let _ = ret.send(result);
+            },
+            DocumentCommand::Reset {
+                persistence,
+                revisions,
+                ret,
+            } => {
+                let result = self
+                    .synchronizer
+                    .reset(persistence, revisions)
                     .await
                     .map_err(internal_error);
                 let _ = ret.send(result);
diff --git a/shared-lib/flowy-collaboration/src/sync/synchronizer.rs b/shared-lib/flowy-collaboration/src/sync/synchronizer.rs
index 7f17c5bfcd..550c50ef15 100644
--- a/shared-lib/flowy-collaboration/src/sync/synchronizer.rs
+++ b/shared-lib/flowy-collaboration/src/sync/synchronizer.rs
@@ -8,6 +8,7 @@ use crate::{
     sync::DocumentPersistence,
 };
 
+use crate::util::make_delta_from_revisions;
 use lib_ot::{core::OperationTransformable, rich_text::RichTextDelta};
 use parking_lot::RwLock;
 use std::{
@@ -51,11 +52,11 @@ impl RevisionSynchronizer {
     #[tracing::instrument(level = "debug", skip(self, user, revisions, persistence), err)]
     pub async fn sync_revisions(
         &self,
-        doc_id: String,
         user: Arc<dyn RevisionUser>,
         revisions: Vec<Revision>,
         persistence: Arc<dyn DocumentPersistence>,
     ) -> Result<(), CollaborateError> {
+        let doc_id = self.doc_id.clone();
         if revisions.is_empty() {
             // Return all the revisions to client
             let revisions = persistence.get_doc_revisions(&doc_id).await?;
@@ -112,11 +113,11 @@ impl RevisionSynchronizer {
     #[tracing::instrument(level = "debug", skip(self, user, persistence), err)]
     pub async fn pong(
         &self,
-        doc_id: String,
         user: Arc<dyn RevisionUser>,
         persistence: Arc<dyn DocumentPersistence>,
         rev_id: i64,
     ) -> Result<(), CollaborateError> {
+        let doc_id = self.doc_id.clone();
         let server_base_rev_id = self.rev_id.load(SeqCst);
         match server_base_rev_id.cmp(&rev_id) {
             Ordering::Less => tracing::error!(
@@ -138,6 +139,21 @@ impl RevisionSynchronizer {
         Ok(())
     }
 
+    #[tracing::instrument(level = "debug", skip(self, revisions), err)]
+    pub async fn reset(
+        &self,
+        persistence: Arc<dyn DocumentPersistence>,
+        revisions: Vec<Revision>,
+    ) -> Result<(), CollaborateError> {
+        let doc_id = self.doc_id.clone();
+        let _ = persistence.reset_document(&doc_id, revisions.clone()).await?;
+        let delta = make_delta_from_revisions(revisions)?;
+        let new_document = Document::from_delta(delta);
+        *self.document.write() = new_document;
+
+        Ok(())
+    }
+
     pub fn doc_json(&self) -> String { self.document.read().to_json() }
 
     fn compose_revision(&self, revision: &Revision) -> Result<(), CollaborateError> {
diff --git a/shared-lib/flowy-collaboration/src/util.rs b/shared-lib/flowy-collaboration/src/util.rs
index 0aa22b2bc1..ae232252ac 100644
--- a/shared-lib/flowy-collaboration/src/util.rs
+++ b/shared-lib/flowy-collaboration/src/util.rs
@@ -1,4 +1,11 @@
-use lib_ot::core::{NEW_LINE, WHITESPACE};
+use crate::{
+    entities::revision::Revision,
+    errors::{CollaborateError, CollaborateResult},
+};
+use lib_ot::{
+    core::{OperationTransformable, NEW_LINE, WHITESPACE},
+    rich_text::RichTextDelta,
+};
 use std::sync::atomic::{AtomicI64, Ordering::SeqCst};
 
 #[inline]
@@ -32,3 +39,15 @@ impl RevIdCounter {
 
     pub fn set(&self, n: i64) { let _ = self.0.fetch_update(SeqCst, SeqCst, |_| Some(n)); }
 }
+
+pub fn make_delta_from_revisions(revisions: Vec<Revision>) -> CollaborateResult<RichTextDelta> {
+    let mut new_delta = RichTextDelta::new();
+    for revision in revisions {
+        let delta = RichTextDelta::from_bytes(revision.delta_data).map_err(|e| {
+            let err_msg = format!("Deserialize remote revision failed: {:?}", e);
+            CollaborateError::internal().context(err_msg)
+        })?;
+        new_delta = new_delta.compose(&delta)?;
+    }
+    Ok(new_delta)
+}