According to the principle of frame semantics, this paper realizes semantic analysis on question sentence based on the work of constructing a question sentence analysis oriented semantic frame which is called Q frame. The thought of design is as follows: Firstly, identify the target words of different type of question sentences on the basis of Chinese syntactic dependency relation. Secondly, implement the Q frame semantics analysis of question sentences by method of schema matching. Thirdly, the frame semantic annotation to question sentences is completed through mapping relations. Finally, question focus and question type of sentences are identified.