diff --git a/src/ot/client.ts b/src/ot/client.ts
index 938d004..def3135 100644
--- a/src/ot/client.ts
+++ b/src/ot/client.ts
@@ -40,12 +40,27 @@ export class Client {
     if (revision < 0 || this.revision > revision) {
       throw new Error("operation revision not in history");
     }
+    if (revision < this.revision) {
+      return;
+    }
 
     const isSelfOp = operation.id === this.outstanding?.id;
 
+    if (this.outstanding) {
+      // 将outstanding操作转化为执行operation后的操作
+      const newOp = TextOperation.transform(this.outstanding, operation);
+      newOp.id = this.outstanding.id;
+      this.outstanding = newOp;
+    }
+
     for (let i = 0; i < this.buffer.length; i++) {
       // 将buffer中的操作转换为基于服务端文档状态的操作
-      const newOp = TextOperation.transform(this.buffer[i], this.buffer[i - 1] || operation);
+      // FIXME: 对buffer中的操作应该合并后再transform
+      const newOp = TextOperation.transform(
+        this.buffer[i],
+        // 如果有outstanding，buffer[0]应该基于outstanding
+        this.buffer[i - 1] || this.outstanding || operation
+      );
       newOp.id = this.buffer[i].id;
       this.buffer[i] = newOp;
     }
@@ -66,7 +81,7 @@ export class Client {
     if (isSelfOp) {
       this.serverAck();
     }
-    console.log('mattuy', 'client', this.name, this)
+    console.log("mattuy", "client", this.name, this);
   }
 
   // 服务端已确认收到发送的操作，从buffer中移除该操作，尝试发送下一个
@@ -88,7 +103,7 @@ export class Client {
     // 向服务端发送本地待提交的操作，这里没有实现操作压缩，我们一个一个发送
     this.outstanding = this.buffer.shift()!;
     // 模拟向服务端发送操作，实际实现应该通过网络
-    server.receiveOperation(this.revision, this.outstanding);
+    server.receiveOperation(this, this.revision, this.outstanding);
     // 应该有超时重发机制，这里没有实现
   }
 
diff --git a/src/ot/server.ts b/src/ot/server.ts
index 0e4cbf0..cbafc6e 100644
--- a/src/ot/server.ts
+++ b/src/ot/server.ts
@@ -16,7 +16,7 @@ class Server {
   }
 
   // 每当从客户端接收到操作时调用此方法
-  async receiveOperation(revision: number, operation: TextOperation) {
+  async receiveOperation(client: Client, revision: number, operation: TextOperation) {
     if (revision < 0 || this.operations.length < revision) {
       throw new Error("operation revision not in history");
     }
@@ -31,6 +31,8 @@ class Server {
       // op' = transform(op, op1)
       // op基于 revision+i 版本的文档操作，op'基于 revision+i+1 版本的文档操作
       operation = transform(operation, concurrentOperations[i]);
+      // 向客户端发送其它客户端的操作
+      client.applyServer(revision + i + 1, concurrentOperations[i]);
     }
     operation.id = opId;