diff --git a/doric-android/devkit/src/main/java/pub/doric/devkit/DevKit.java b/doric-android/devkit/src/main/java/pub/doric/devkit/DevKit.java
index 4326bddf..8281be03 100644
--- a/doric-android/devkit/src/main/java/pub/doric/devkit/DevKit.java
+++ b/doric-android/devkit/src/main/java/pub/doric/devkit/DevKit.java
@@ -9,9 +9,12 @@ import org.greenrobot.eventbus.EventBus;
 import org.greenrobot.eventbus.Subscribe;
 import org.greenrobot.eventbus.ThreadMode;
 
+
 import pub.doric.Doric;
 import pub.doric.DoricContext;
 import pub.doric.DoricContextManager;
+import pub.doric.DoricLibrary;
+import pub.doric.DoricRegistry;
 import pub.doric.devkit.event.ConnectExceptionEvent;
 import pub.doric.devkit.event.EOFExceptionEvent;
 import pub.doric.devkit.event.EnterDebugEvent;
@@ -31,6 +34,16 @@ public class DevKit implements IDevKit {
     }
 
     private DevKit() {
+        Doric.registerLibrary(new DoricLibrary() {
+            @Override
+            public void load(DoricRegistry registry) {
+                registry.registerMonitor(new DoricDevMonitor());
+            }
+        });
+        for (DoricContext context : DoricContextManager.aliveContexts()) {
+            context.getDriver().getRegistry().registerMonitor(new DoricDevMonitor());
+            break;
+        }
         EventBus.getDefault().register(this);
     }
 
diff --git a/doric-android/devkit/src/main/java/pub/doric/devkit/DoricDevMonitor.java b/doric-android/devkit/src/main/java/pub/doric/devkit/DoricDevMonitor.java
new file mode 100644
index 00000000..d09b059e
--- /dev/null
+++ b/doric-android/devkit/src/main/java/pub/doric/devkit/DoricDevMonitor.java
@@ -0,0 +1,70 @@
+/*
+ * Copyright [2019] [Doric.Pub]
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package pub.doric.devkit;
+
+import android.util.Log;
+
+import com.google.gson.JsonObject;
+
+import java.io.StringWriter;
+
+import pub.doric.DoricContext;
+import pub.doric.IDoricMonitor;
+import pub.doric.utils.DoricLog;
+
+/**
+ * @Description: pub.doric.devkit
+ * @Author: pengfei.zhou
+ * @CreateDate: 2/5/21
+ */
+public class DoricDevMonitor implements IDoricMonitor {
+    @Override
+    public void onException(DoricContext context, Exception e) {
+        if (!DoricDev.getInstance().isInDevMode()) {
+            return;
+        }
+        JsonObject jsonObject = new JsonObject();
+        jsonObject.addProperty("source", "In source file: " + (context != null ? context.getSource() : "Unknown"));
+        StringWriter stringWriter = new StringWriter();
+        jsonObject.addProperty("exception", stringWriter.toString());
+        DevKit.getInstance().sendDevCommand(IDevKit.Command.EXCEPTION, jsonObject);
+    }
+
+    @Override
+    public void onLog(int type, String message) {
+        if (!DoricDev.getInstance().isInDevMode()) {
+            return;
+        }
+        String typeString = "DEFAULT";
+        switch (type) {
+            case Log.ERROR:
+                DoricLog.suffix_e("_js", message);
+                typeString = "ERROR";
+                break;
+            case Log.WARN:
+                DoricLog.suffix_w("_js", message);
+                typeString = "WARN";
+                break;
+            default:
+                DoricLog.suffix_d("_js", message);
+                break;
+        }
+        JsonObject jsonObject = new JsonObject();
+        jsonObject.addProperty("type", typeString);
+        jsonObject.addProperty("message", message);
+        DevKit.getInstance().sendDevCommand(IDevKit.Command.LOG, jsonObject);
+    }
+}
diff --git a/doric-cli/src/dev.ts b/doric-cli/src/dev.ts
index 2bf1e066..8385c65f 100644
--- a/doric-cli/src/dev.ts
+++ b/doric-cli/src/dev.ts
@@ -60,12 +60,20 @@ export default async function dev() {
   await delay(3000);
   console.warn("Start watching");
   server.listen(7777);
+  const cachedContents: Record<string, string> = {}
   chokidar
     .watch(process.cwd() + "/bundle", {
       ignored: /.*?\.map/,
       alwaysStat: true,
     })
     .on("change", (jsFile) => {
+      const content = fs.readFileSync(jsFile, "utf-8");
+      if (cachedContents[jsFile]) {
+        if (content.indexOf(cachedContents[jsFile]) >= 0) {
+          return;
+        }
+      }
+      cachedContents[jsFile] = content;
       console.log("*******", jsFile.replace(process.cwd(), "")
         .replace("/bundle/src/", "")
         .replace(".js", "")
@@ -74,23 +82,21 @@ export default async function dev() {
         console.log("debugging, hot reload by pass");
         return;
       }
-      fs.readFile(jsFile, "utf-8", (error, data) => {
-        try {
-          const sourceMap = mergeMap(`${jsFile}.map`);
-          server.connections.forEach((e: any) => {
-            e.sendText(
-              JSON.stringify({
-                cmd: "RELOAD",
-                script: data,
-                source: (jsFile.match(/[^/\\]*$/) || [""])[0],
-                sourceMap,
-              })
-            );
-          });
-        } catch (e) {
-          console.error(e);
-        }
-      });
+      try {
+        const sourceMap = mergeMap(`${jsFile}.map`);
+        server.connections.forEach((e: any) => {
+          e.sendText(
+            JSON.stringify({
+              cmd: "RELOAD",
+              script: content,
+              source: (jsFile.match(/[^/\\]*$/) || [""])[0],
+              sourceMap,
+            })
+          );
+        });
+      } catch (e) {
+        console.error(e);
+      }
     });
 
 
diff --git a/doric-cli/src/server.ts b/doric-cli/src/server.ts
index 013449dd..83616d42 100644
--- a/doric-cli/src/server.ts
+++ b/doric-cli/src/server.ts
@@ -50,11 +50,11 @@ export async function createServer() {
                     break;
                 case 'LOG':
                     if (resultObject.data.type == 'DEFAULT') {
-                        console.log((resultObject.data.message as string).green);
+                        console.log(`>>>>>>${(resultObject.data.message as string).green}>>>>>>`);
                     } else if (resultObject.data.type == 'ERROR') {
-                        console.log((resultObject.data.message as string).red);
+                        console.log(`>>>>>>${(resultObject.data.message as string).red}>>>>>>`);
                     } else if (resultObject.data.type == 'WARN') {
-                        console.log((resultObject.data.message as string).yellow);
+                        console.log(`>>>>>>${(resultObject.data.message as string).yellow}>>>>>>`);
                     }
                     break
             }
diff --git a/doric-iOS/Devkit/Classes/DoricDev.m b/doric-iOS/Devkit/Classes/DoricDev.m
index 9e765f6c..710eda62 100644
--- a/doric-iOS/Devkit/Classes/DoricDev.m
+++ b/doric-iOS/Devkit/Classes/DoricDev.m
@@ -28,6 +28,16 @@
 #import "DoricWSClient.h"
 #import "DoricDebugDriver.h"
 #import "DoricDevViewController.h"
+#import "DoricDevMonitor.h"
+
+@interface DoricDevLibrary : DoricLibrary
+@end
+
+@implementation DoricDevLibrary
+- (void)load:(DoricRegistry *)registry {
+
+}
+@end
 
 @interface DoricDev ()
 @property(nonatomic, strong) DoricWSClient *wsclient;
@@ -46,6 +56,12 @@ - (instancetype)init {
         [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(onEnterDebugEvent) name:@"EnterDebugEvent" object:nil];
         [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(onStopDebugEvent) name:@"StopDebugEvent" object:nil];
         [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(onDebuggerReadyEvent) name:@"DebuggerReadyEvent" object:nil];
+        [Doric registerLibrary:[DoricDevLibrary new]];
+        NSValue *value = DoricContextManager.instance.aliveContexts.firstObject;
+        if (value) {
+            DoricContext *context = value.nonretainedObjectValue;
+            [context.driver.registry registerMonitor:[DoricDevMonitor new]];
+        }
     }
     return self;
 }
diff --git a/doric-iOS/Devkit/Classes/DoricDevMonitor.h b/doric-iOS/Devkit/Classes/DoricDevMonitor.h
new file mode 100644
index 00000000..55c29233
--- /dev/null
+++ b/doric-iOS/Devkit/Classes/DoricDevMonitor.h
@@ -0,0 +1,16 @@
+//
+//  DoricDevMonitor.h
+//  DoricDevkit
+//
+//  Created by pengfei.zhou on 2021/2/5.
+//
+
+#import <Foundation/Foundation.h>
+#import "DoricMonitorProtocol.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface DoricDevMonitor : NSObject <DoricMonitorProtocol>
+@end
+
+NS_ASSUME_NONNULL_END
diff --git a/doric-iOS/Devkit/Classes/DoricDevMonitor.m b/doric-iOS/Devkit/Classes/DoricDevMonitor.m
new file mode 100644
index 00000000..a90ac42d
--- /dev/null
+++ b/doric-iOS/Devkit/Classes/DoricDevMonitor.m
@@ -0,0 +1,55 @@
+//
+//  DoricDevMonitor.m
+//  DoricDevkit
+//
+//  Created by pengfei.zhou on 2021/2/5.
+//
+
+#import "DoricDevMonitor.h"
+
+#import "DoricDev.h"
+#import "NSString+JsonString.h"
+#import "Doric.h"
+
+@implementation DoricDevMonitor
+- (void)onException:(NSException *)exception inContext:(DoricContext *)context {
+    if (!DoricDev.instance.isInDevMode) {
+        return;
+    }
+    NSDictionary *jsonDic = @{
+            @"cmd": @"EXCEPTION",
+            @"data": @{
+                    @"source": [context.source stringByReplacingOccurrencesOfString:@".js" withString:@".ts"],
+                    @"exception": exception.reason
+            }
+    };
+
+    NSString *jsonStr = [NSString dc_convertToJsonWithDic:jsonDic];
+    [[DoricDev instance] sendDevCommand:jsonStr];
+}
+
+- (void)onLog:(DoricLogType)type message:(NSString *)message {
+    if (!DoricDev.instance.isInDevMode) {
+        return;
+    }
+    NSString *typeString = @"DEFAULT";
+    if (type == DoricLogTypeDebug) {
+        typeString = @"DEFAULT";
+    } else if (type == DoricLogTypeWarning) {
+        typeString = @"WARN";
+    } else if (type == DoricLogTypeError) {
+        typeString = @"ERROR";
+    }
+
+    NSDictionary *jsonDic = @{
+            @"cmd": @"LOG",
+            @"data": @{
+                    @"type": typeString,
+                    @"message": message
+            }
+    };
+
+    NSString *jsonStr = [NSString dc_convertToJsonWithDic:jsonDic];
+    [[DoricDev instance] sendDevCommand:jsonStr];
+}
+@end