In numerous of network applications, network Forum of development is very quickly. For different of crowd and different of interest hobby always has some forum of some discussion district is we are interested in. But because of complex structuction of forum, new user has a takes of problem for how to find the correct discussion district to post into. Through researching complex network of related theory, for this problem we made a category recommended algorithm for discussion district posts. After validation and test, it is proved that the algorithm is effective, and it could be to provide users with useful help in distress of the problem.