In order to solve the current problems of untimely teacher-student communication and lack of ability of low willingness to communicate online in the interactive Q&A session in the hybrid teaching mode, we designed and implemented an intelligent interactive Q&A system based on WeChat with the help of WeChat development platform and Baidu UNIT intelligent platform, which can provide students with intelligent answers, knowledge retrieval, online interactive communication between teachers and students, intelligent message reply and push, Q&A information management and other functions. The results show that the system improves the teacher-student interaction mode in blended teaching and provides a more simple and easy-to-use interactive Q&A service for teachers and students, with strong usability.