This paper deals with pragmatic constraints on co-occurrence between the attribution shield hedge “tingshuo” and the interrogative type in Modern Chinese. Based on CCL corpus analysis, it has been revealed that the hedge “tingshuo” only co-occur with the yes/no interrogatives with rising intonation and the tag questions. This can be interpreted as the mitigation strategy to produce conversational implicature by moving deictic center. It was also related to the indirect speech act to protect hearer's face by weakening the illocutionary force. Moreover, the hedge “tingshuo” in interrogatives plays an important role to start a conversation and to socialize with people. Lastly, the hedge “tingshuo” can function as an indicator of the degree of questioning. These results differ from the existing viewpoint of conventional structural linguistics, which call for more research in syntax-pragmatics interface.