Abstract: Evolution is an important part in the software life cycle.Now,much software has evolved several versions,however,how to confirmation evolved software coincides with aim of evolution becomes a problem that calls for immediate solution.Because there is not a systematic method so far,we adopted LDA topic modeling to model analyses for evolution confirmation.LDA can model some features in the software source code,through the model the latent topics can be analyzed in the source code. We made the extracted topic compare with the published reports of software evolution to find out the distinctions between them,and according to the distinctions whether the software evolution satisfy the purpose of evolution can be confirmed.

Key words: Software evolution,Confirmation,LDA,Topic