The game-based approach can arouse learners’ interests in international Chinese teaching and improve teaching efficiency. Teacher talk has a key impact on the application of games, but there are few studies on it in classroom games. This paper uses the game-based approach to design vocabulary teaching, recorded the classroom teaching conducted by a pre-service teacher, and transcribed the video into texts. In view of the problems existing in the simulation teaching, this paper puts forward some suggestions, which can be used for improving the discourse quality of pre-service teachers and as a reference for teacher training in international Chinese teaching.