diff --git a/libs/components/editor-core/src/editor/block/async-block.ts b/libs/components/editor-core/src/editor/block/async-block.ts
index 73db5de087..1bdc7ef086 100644
--- a/libs/components/editor-core/src/editor/block/async-block.ts
+++ b/libs/components/editor-core/src/editor/block/async-block.ts
@@ -180,9 +180,49 @@ export class AsyncBlock {
         return this.event_emitter.emit(eventName, eventData);
     }
 
-    onUpdate(callback: (event: EventData) => void) {
-        this.on('update', callback);
+    /**
+     * @param deep observe deep
+     *
+     * NOTICE: the observe of children is async,
+     * so there maybe have some delay before observe done.
+     */
+    onUpdate(callback: (event: EventData) => void, deep = 0) {
+        let expired = false;
+        const unobserveMap: Record<string, () => void> = {};
+        const observeChildren = () => {
+            if (deep <= 0) {
+                return;
+            }
+            this.children().then(children => {
+                // Check current event listeners is not expired
+                if (expired) {
+                    return;
+                }
+                children.forEach(child => {
+                    if (unobserveMap[child.id]) return;
+                    const unobserve = child.onUpdate(callback, deep - 1);
+                    unobserveMap[child.id] = unobserve;
+                });
+            });
+        };
+
+        const unobserveChildren = () => {
+            Object.values(unobserveMap).forEach(unobserve => {
+                unobserve();
+            });
+        };
+
+        this.on('update', e => {
+            callback(e);
+            // Update children observe
+            observeChildren();
+        });
+
+        observeChildren();
+
         return () => {
+            expired = true;
+            unobserveChildren();
             this.off('update', callback);
         };
     }
diff --git a/libs/components/editor-core/src/render-block/RenderKanbanBlock.tsx b/libs/components/editor-core/src/render-block/RenderKanbanBlock.tsx
index f9b532f6b3..0044a4e6aa 100644
--- a/libs/components/editor-core/src/render-block/RenderKanbanBlock.tsx
+++ b/libs/components/editor-core/src/render-block/RenderKanbanBlock.tsx
@@ -40,6 +40,8 @@ export const KanbanParentBlockRender = ({
 };
 
 const useBlockProgress = (block?: AsyncBlock) => {
+    // Progress of the progress bar. The range is between 0 and 1.
+    // Default progress is 1, that is 100%.
     const [progress, setProgress] = useState(1);
 
     useEffect(() => {
@@ -57,36 +59,13 @@ const useBlockProgress = (block?: AsyncBlock) => {
             setProgress(checkedTodoChildren.length / todoChildren.length);
         };
 
-        let childrenQueue: (() => void)[] = [];
-        const childrenUnobserve = () => {
-            childrenQueue.forEach(fn => fn());
-            childrenQueue = [];
-        };
-
-        const observeChildren = async () => {
-            const children = await block.children();
-
-            childrenUnobserve();
-            children.forEach(child => {
-                const unobserve = child.onUpdate(() => {
-                    updateProgress();
-                });
-                childrenQueue.push(unobserve);
-            });
-        };
-
-        observeChildren();
         updateProgress();
 
         const unobserve = block.onUpdate(() => {
-            observeChildren();
             updateProgress();
-        });
+        }, 1);
 
-        return () => {
-            unobserve();
-            childrenUnobserve();
-        };
+        return unobserve;
     }, [block]);
 
     return progress;
diff --git a/libs/datasource/db-service/src/services/database/index.ts b/libs/datasource/db-service/src/services/database/index.ts
index d6d013a3d3..3d70345f0f 100644
--- a/libs/datasource/db-service/src/services/database/index.ts
+++ b/libs/datasource/db-service/src/services/database/index.ts
@@ -168,7 +168,7 @@ export class Database {
             block.on('children', observer_name, listener);
             block.on('content', observer_name, listener);
             block.on('parent', observer_name, listener);
-            block.on('cascade', observer_name, listener);
+            // block.on('cascade', observer_name, listener);
         }
         this.#observers.setStatus(observer_name, 'observing');
 
@@ -189,7 +189,7 @@ export class Database {
                 block.off('children', observer_name);
                 block.off('content', observer_name);
                 block.off('parent', observer_name);
-                block.off('cascade', observer_name);
+                // block.off('cascade', observer_name);
             }
         }
     }