diff --git a/docs/Deployment.md b/docs/Deployment.md
index d630c9d..002b7b0 100644
--- a/docs/Deployment.md
+++ b/docs/Deployment.md
@@ -89,6 +89,8 @@ builtin:
     None
 ```
 
+> Hint for postgresql: you need to create database with encoding utf8 by your own. pyspider will not create database for you.
+
 running
 -------
 
diff --git a/tools/migrate.py b/tools/migrate.py
new file mode 100755
index 0000000..f092daa
--- /dev/null
+++ b/tools/migrate.py
@@ -0,0 +1,69 @@
+#!/usr/bin/env python
+# -*- encoding: utf-8 -*-
+# vim: set et sw=4 ts=4 sts=4 ff=unix fenc=utf8:
+# Author: Binux<roy@binux.me>
+#         http://binux.me
+# Created on 2015-09-30 23:22:46
+
+import click
+import logging
+from pyspider.database.base.projectdb import ProjectDB
+from pyspider.database.base.taskdb import TaskDB
+from pyspider.database.base.resultdb import ResultDB
+from pyspider.database import connect_database
+from pyspider.libs.utils import unicode_obj
+from multiprocessing.pool import ThreadPool as Pool
+
+logging.getLogger().setLevel(logging.INFO)
+
+
+def taskdb_migrating(project, from_connection, to_connection):
+    logging.info("taskdb: %s", project)
+    f = connect_database(from_connection)
+    t = connect_database(to_connection)
+    t.drop(project)
+    for status in range(1, 5):
+        for task in f.load_tasks(status, project=project):
+            t.insert(project, task['taskid'], task)
+
+
+def resultdb_migrating(project, from_connection, to_connection):
+    logging.info("resultdb: %s", project)
+    f = connect_database(from_connection)
+    t = connect_database(to_connection)
+    t.drop(project)
+    for result in f.select(project):
+        t.save(project, result['taskid'], result['url'], result['result'])
+
+
+@click.command()
+@click.option('--pool', default=10, help='cocurrent worker size.')
+@click.argument('from_connection', required=1)
+@click.argument('to_connection', required=1)
+def migrate(pool, from_connection, to_connection):
+    """
+    Migrate tool for pyspider
+    """
+    f = connect_database(from_connection)
+    t = connect_database(to_connection)
+
+    if isinstance(f, ProjectDB):
+        for each in f.get_all():
+            each = unicode_obj(each)
+            logging.info("projectdb: %s", each['name'])
+            t.drop(each['name'])
+            t.insert(each['name'], each)
+    elif isinstance(f, TaskDB):
+        pool = Pool(pool)
+        pool.map(
+            lambda x, f=from_connection, t=to_connection: taskdb_migrating(x, f, t),
+            f.projects)
+    elif isinstance(f, ResultDB):
+        pool = Pool(pool)
+        pool.map(
+            lambda x, f=from_connection, t=to_connection: resultdb_migrating(x, f, t),
+            f.projects)
+
+
+if __name__ == '__main__':
+    migrate()