Tag question is a special sort of the non-interrogative sentence, which is one of the Chinese general question sentences, including the special questions, the non-interrogative sentence, the positive questions and the select questions. X-shiba, which is one of the main tag questions, consists of a statement X and a tag form shiba. X-shiba presents strong settability in syntax because of the weak replaceability in paradigmatic relations and strong stability in syntagmatic relations. In addition, the meaning of the construction, which can be generalized as strongly convinced and weakly interrogatory, is solidified and unanalyzable. In an interactive approach, of the construction X-shiba reflects four functions. The first is weakly interrogatory function, which can be supported by the corpus analysis based on BBC. The second function is the desire for approval. An analysis based on the BLCU Corpus Center shows that most of the answers to X-shiba are positive, and the answers should be clear and detailed if they are negative. The third one is turn-taking, which means the speaker can exchange the role with the listener with the help of the construction X-shiba when he/she doesn’t want to continue the topic. The last function is that the construction can highlight the conversational implicature and propel the communication. The interactional construction grammar declares that the constructions with similar meaning or function can be regarded as a group, in which some constructions are basic and others are derived from the basic construction(s). The Tag question construction X-shiba is a derived one of the low hierarchy in the question construction group.