i want to use some other py package,such as numpy or cx_oracle,i put them into lib dir  and site-package dir,but doesn't work,help,please!!

It should go in your Notepad++\plugins\PythonScript\lib directory (probably under Program Files).  If there's a compiled module in there (usually a .pyd file), then it may or may not work properly (check the console).  If it doesn't, you can try replacing the python27.dll in the Notepad++ directory with the official Python 2.7.1.  If you do this, you'll need to make sure you've got the Visual C runtime 2008 installed too.  Also, if your username has non-ascii characters in it (or there are non-ascii characters in the path to your user scripts), then your scripts may not load properly.

Let us know how it goes - errors should be printed on the console, which will help figure out where the issues are.

Cheers and good luck,
Dave..

sorry for so long time to reply, very buzy recently,
yes,repleace with official Python 2.7.1 dll ,it works(for numpy),
but, if i want to use many py packages, put them all in lib dir will be a little ugly
can i put them in some special dir ,for example, like "site-packages"

Sure, you just need to append the path of your "site-packages" directory to the sys.path list.

So somewhere in your startup.py file

import sys
sys.path.append(notepad.getNppDir() + '\plugins\PythonScript\lib\site-packages')

Dave.