diff --git a/src/keyboard.rs b/src/keyboard.rs
index 740afaf8f..d4a51c0f3 100644
--- a/src/keyboard.rs
+++ b/src/keyboard.rs
@@ -46,6 +46,12 @@ lazy_static::lazy_static! {
     };
 }
 
+#[cfg(feature = "flutter")]
+pub fn set_cur_session(session: Session<FlutterHandler>) {
+    *CUR_SESSION.lock().unwrap() = Some(session);
+}
+
+#[cfg(not(feature = "flutter"))]
 pub fn set_cur_session(session: Session<SciterHandler>) {
     *CUR_SESSION.lock().unwrap() = Some(session);
 }
@@ -91,7 +97,7 @@ pub mod client {
         }
     }
 
-    pub fn process_event(event: Event) {
+    pub fn process_event(event: &Event) {
         if is_long_press(&event) {
             return;
         }
@@ -181,19 +187,25 @@ pub mod client {
 pub fn start_grab_loop() {
     #[cfg(any(target_os = "windows", target_os = "macos"))]
     std::thread::spawn(move || {
-        let func = move |event: Event| match event.event_type {
-            EventType::KeyPress(key) | EventType::KeyRelease(key) => {
-                // fix #2211：CAPS LOCK don't work
-                if key == Key::CapsLock || key == Key::NumLock {
-                    return Some(event);
-                }
-                if KEYBOARD_HOOKED.load(Ordering::SeqCst) {
-                    client::process_event(event);
+        let try_handle_keyboard = move |event: Event, key: Key, is_press: bool| -> Option<Event> {
+            // fix #2211：CAPS LOCK don't work
+            if key == Key::CapsLock || key == Key::NumLock {
+                return Some(event);
+            }
+            if KEYBOARD_HOOKED.load(Ordering::SeqCst) {
+                client::process_event(&event);
+                if is_press {
                     return None;
                 } else {
                     return Some(event);
                 }
+            } else {
+                return Some(event);
             }
+        };
+        let func = move |event: Event| match event.event_type {
+            EventType::KeyPress(key) => try_handle_keyboard(event, key, true),
+            EventType::KeyRelease(key) => try_handle_keyboard(event, key, false),
             _ => Some(event),
         };
         if let Err(error) = rdev::grab(func) {
@@ -207,7 +219,7 @@ pub fn start_grab_loop() {
             if let Key::Unknown(keycode) = key {
                 log::error!("rdev get unknown key, keycode is : {:?}", keycode);
             } else {
-                client::process_event(event);
+                client::process_event(&event);
             }
             None
         }
@@ -237,7 +249,7 @@ pub fn release_remote_keys() {
     for key in to_release {
         let event_type = EventType::KeyRelease(key);
         let event = event_type_to_event(event_type);
-        client::process_event(event);
+        client::process_event(&event);
     }
 }
 
diff --git a/src/ui.rs b/src/ui.rs
index 921c137ec..e13f11d87 100644
--- a/src/ui.rs
+++ b/src/ui.rs
@@ -130,8 +130,9 @@ pub fn start(args: &mut [String]) {
                 pass.clone(),
                 args.clone(),
             );
-            let inner = handler.inner();
-            crate::keyboard::set_cur_session(inner);
+            #[cfg(not(feature = "flutter"))]
+            crate::keyboard::set_cur_session(handler.inner());
+            
             Box::new(handler)
         });
         page = "remote.html";
diff --git a/src/ui_session_interface.rs b/src/ui_session_interface.rs
index e594ac94b..0cf2f2e2d 100644
--- a/src/ui_session_interface.rs
+++ b/src/ui_session_interface.rs
@@ -393,7 +393,7 @@ impl<T: InvokeUiSession> Session<T> {
             scan_code: scancode as _,
             event_type: event_type,
         };
-        keyboard::client::process_event(event);
+        keyboard::client::process_event(&event);
     }
 
     // flutter only TODO new input