diff --git a/build.sh b/build.sh
index efe3129..ef08f3f 100755
--- a/build.sh
+++ b/build.sh
@@ -4,7 +4,7 @@ if [ -d unpack ]; then
   sudo rm -rf unpack
 fi
 
-version="0.1.0"
+version="0.2.0"
 
 mkdir -p unpack/DEBIAN
 
diff --git a/debian/control b/debian/control
index 2bbbeb3..70ca588 100644
--- a/debian/control
+++ b/debian/control
@@ -1,5 +1,5 @@
 Package: python3-webengine-gtk3
-Version: 0.1.0
+Version: 0.2.0
 Section: develop
 Priority: optional
 Maintainer: Yutent <yutent.io@gmail.com>
diff --git a/usr/lib/python3/dist-packages/webengine/gtk3/__init__.py b/usr/lib/python3/dist-packages/webengine/gtk3/__init__.py
index 3df6f4f..76b2c1b 100644
--- a/usr/lib/python3/dist-packages/webengine/gtk3/__init__.py
+++ b/usr/lib/python3/dist-packages/webengine/gtk3/__init__.py
@@ -4,7 +4,8 @@
 
 from webengine.gtk3._webengine import WebEngine
 from webengine.gtk3._settings import create_setting
+from webengine.gtk3._hotreload import create_hmr_server
 
 
-build = (0, 1, 0)
+build = (0, 2, 0)
 version = '.'.join(map(str, build))
diff --git a/usr/lib/python3/dist-packages/webengine/gtk3/_hotreload.py b/usr/lib/python3/dist-packages/webengine/gtk3/_hotreload.py
new file mode 100644
index 0000000..a6a3213
--- /dev/null
+++ b/usr/lib/python3/dist-packages/webengine/gtk3/_hotreload.py
@@ -0,0 +1,54 @@
+#!/usr/bin/env python3
+
+
+import time, os
+
+try:
+  from watchdog.observers import Observer
+  from watchdog.events import FileSystemEventHandler
+except:
+  Observer = None
+  FileSystemEventHandler = object
+
+
+class DogHandler(FileSystemEventHandler):
+
+  last_reload = 0
+
+  def __init__(self, webview):
+    super().__init__()
+    self.webview = webview
+
+
+  def on_modified(self, event):
+    if os.path.isfile(event.src_path):
+      stamp = int(time.time())
+      # 1秒内有多个修改, 不重复reload
+      if stamp == self.last_reload:
+        return
+      
+      self.last_reload = stamp
+      self.webview.reload()
+
+    
+
+
+def create_hmr_server(options = None):
+  if Observer is None:
+    print('Warning: HMR server depends on "python-watchdog". Please install it before using it')
+    dog = None
+  else:
+    dog = Observer()
+  
+
+  def wrapper(app, extra = None):
+    if dog is None:
+      return
+    
+    if app.root:
+      dog.schedule(DogHandler(app), app.root, recursive=True)
+      dog.start()
+    else:
+      raise SyntaxError('Web root must be set before HMR server starts.')
+
+  return wrapper
\ No newline at end of file
diff --git a/usr/lib/python3/dist-packages/webengine/gtk3/_settings.py b/usr/lib/python3/dist-packages/webengine/gtk3/_settings.py
index d668c50..af3fbcf 100644
--- a/usr/lib/python3/dist-packages/webengine/gtk3/_settings.py
+++ b/usr/lib/python3/dist-packages/webengine/gtk3/_settings.py
@@ -22,7 +22,7 @@ class Settings(WebKit2.Settings):
     self.set_javascript_can_open_windows_automatically(True)
 
 
-    self.set_user_agent_with_application_details('WebEngine', '0.1.0')
+    self.set_user_agent_with_application_details('WebEngine', '0.2.0')
 
 
     # indexedDB 和 localStorage 和 离线缓存