thanks to John Patterson
as you said, i do
1.copy /WEB-INF/appengine-generated/   to   D:/   and delete the old
local_db.bin
2.create showcut (D:\appengine-generated\local_db.bin)  and copy  to /
WEB-INF/appengine-generated/
3.restart server.

but the exception throws:

java.lang.NullPointerException
        at java.util.concurrent.ConcurrentHashMap.put(ConcurrentHashMap.java:
881)
        at
com.google.appengine.tools.development.LocalHttpRequestEnvironment.<init>(LocalHttpRequestEnvironment.java:
45)
        at com.google.appengine.tools.development.JettyContainerService
$ApiProxyHandler.handle(JettyContainerService.java:348)
        at
org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:
139)
        at org.mortbay.jetty.Server.handle(Server.java:313)
        at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:
506)
        at org.mortbay.jetty.HttpConnection
$RequestHandler.headerComplete(HttpConnection.java:830)
        at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:514)
        at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
        at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:381)
        at
org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:
396)
        at org.mortbay.thread.BoundedThreadPool
$PoolThread.run(BoundedThreadPool.java:442)

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