Yes you can with AIR 3.0 SDK, which you can download from Adobe Labs:
The documentation you are looking for is under Native Extensions:
Hope that helps,
Thanks for your answer,
I want to develop Iphone applicaiton using Flex.
And I got a third party object-c library,
I read the url you get to me, very sorry that I sitll don't know how to
implement the object-c libray in Flex, would you please provide an sample?