diff --git a/src/plugin/api.rs b/src/plugin/api.rs
deleted file mode 100644
index 744032e88..000000000
--- a/src/plugin/api.rs
+++ /dev/null
@@ -1,14 +0,0 @@
-use std::ffi::{c_char};
-
-use lazy_static::lazy_static;
-
-use crate::{
-    flutter::{FlutterHandler, SESSIONS},
-    plugins::PLUGIN_REGISTRAR,
-    ui_session_interface::Session,
-};
-
-pub trait Callable {
-    // Call 
-    fn onCall(method_name: String) -> bool;
-}
\ No newline at end of file
diff --git a/src/plugin/mod.rs b/src/plugin/mod.rs
index 09d0c63cb..dea7dbd2d 100644
--- a/src/plugin/mod.rs
+++ b/src/plugin/mod.rs
@@ -8,7 +8,8 @@ mod errno;
 pub mod ipc;
 mod plog;
 mod plugins;
-pub mod api;
+pub mod native;
+mod native_handlers;
 
 pub use plugins::{
     handle_client_event, handle_listen_event, handle_server_event, handle_ui_event, load_plugin,
diff --git a/src/plugin/native.rs b/src/plugin/native.rs
new file mode 100644
index 000000000..dad61099e
--- /dev/null
+++ b/src/plugin/native.rs
@@ -0,0 +1,16 @@
+use std::{ffi::{c_char, c_void}, os::raw::c_uint};
+
+/// The native returned value from librustdesk native.
+/// 
+/// [Note]
+/// The data is owned by librustdesk.
+#[repr(C)]
+pub struct NativeReturnValue{
+    return_type: c_uint,
+    data: *const c_void
+}
+
+pub(super) extern "C" fn cb_native_data(method: *const c_char, json: *const c_char, raw: *const c_void, raw_len: usize) -> NativeReturnValue {
+    // TODO: cb for native data.
+    return NativeReturnValue { return_type: 0, data: std::ptr::null() };
+}
\ No newline at end of file
diff --git a/src/plugin/native_handlers/mod.rs b/src/plugin/native_handlers/mod.rs
new file mode 100644
index 000000000..9f7011cb2
--- /dev/null
+++ b/src/plugin/native_handlers/mod.rs
@@ -0,0 +1,24 @@
+use std::ffi::{c_void, c_ulonglong, c_ulong};
+
+use serde_json::Map;
+
+pub mod session;
+
+pub type NR = super::native::NativeReturnValue;
+pub type PluginNativeHandlerRegistrar = NativeHandlerRegistrar<dyn PluginNativeHandler>;
+
+pub struct NativeHandlerRegistrar<H>{
+    handlers: Vec<H>
+}
+
+pub(crate) trait PluginNativeHandler {
+    /// Try to handle the method with the given data.
+    /// 
+    /// Returns: None for the message does not be handled by this handler.
+    fn on_message(method: &String, data: &Map<String, serde_json::Value>) -> Option<NR>;
+
+    /// Try to handle the method with the given data and extra void binary data.
+    /// 
+    /// Returns: None for the message does not be handled by this handler.
+    fn on_message_raw(method: &String, data: &Map<String, serde_json::Value>, raw: *const c_void, raw_len: usize) -> Option<NR>; 
+}
\ No newline at end of file
diff --git a/src/plugin/native_handlers/session.rs b/src/plugin/native_handlers/session.rs
new file mode 100644
index 000000000..f8e8baa67
--- /dev/null
+++ b/src/plugin/native_handlers/session.rs
@@ -0,0 +1,28 @@
+use super::PluginNativeHandler;
+
+
+/// Session related handler for librustdesk core.
+pub struct PluginNativeSessionHandler;
+
+
+impl PluginNativeHandler for PluginNativeSessionHandler {
+    fn on_message(method: &String, data: &serde_json::Map<String, serde_json::Value>) -> Option<super::NR> {
+        None
+    }
+
+    fn on_message_raw(method: &String, data: &serde_json::Map<String, serde_json::Value>, raw: *const std::ffi::c_void, raw_len: usize) -> Option<super::NR> {
+        None
+    }
+
+}
+
+impl PluginNativeSessionHandler {
+    fn create_session()  {
+
+    }
+
+
+    fn add_session_hook() {
+        
+    }
+}
\ No newline at end of file
diff --git a/src/plugin/plugins.rs b/src/plugin/plugins.rs
index a17f24980..4441d314d 100644
--- a/src/plugin/plugins.rs
+++ b/src/plugin/plugins.rs
@@ -14,7 +14,7 @@ use std::{
     collections::HashMap,
     ffi::{c_char, c_void},
     path::PathBuf,
-    sync::{Arc, RwLock},
+    sync::{Arc, RwLock}, os::raw::c_uint,
 };
 
 const METHOD_HANDLE_UI: &[u8; 10] = b"handle_ui\0";
@@ -91,6 +91,14 @@ type CallbackGetId = extern "C" fn() -> *const c_char;
 /// level: "error", "warn", "info", "debug", "trace".
 /// msg:   The message.
 type CallbackLog = extern "C" fn(level: *const c_char, msg: *const c_char);
+
+/// Callback to the librustdesk core.
+/// 
+/// method: the method name of this callback.
+/// json: the json data for the parameters. The argument *must* be non-null.
+/// raw: the binary data for this call, nullable.
+/// raw_len: the length of this binary data, only valid when we pass raw data to `raw`.
+type CallbackNative = extern "C" fn(method: *const c_char, json: *const c_char, raw: *const c_void, raw_len: usize) -> super::native::NativeReturnValue;
 /// The main function of the plugin on the client(self) side.
 ///
 /// method: The method. "handle_ui" or "handle_peer"
@@ -140,6 +148,7 @@ struct Callbacks {
     get_conf: CallbackGetConf,
     get_id: CallbackGetId,
     log: CallbackLog,
+    native: CallbackNative
 }
 
 /// The plugin initialize data.
@@ -334,6 +343,7 @@ fn load_plugin_path(path: &str) -> ResultType<()> {
             get_conf: config::cb_get_conf,
             get_id: config::cb_get_local_peer_id,
             log: super::plog::plugin_log,
+            native: super::native::cb_native_data
         },
     };
     plugin.init(&init_data, path)?;