Applying information technology to education is spreading in the age of internet plus. Informative education has imposed huge impacts on traditional higher education in many aspects, such as education concepts, education system, education pattern, education methods and education means, etc. In this context, a teaching assistant system based on WeChat public platform was developed to provide an open mobile learning platform and to solve the problems of traditional higher education, such as the update latency of textbooks, the conflicts of personalized learning, the single evaluation method, the inefficient roll call, etc. The system has been applied twice for civil engineering students in the building architecture course, and the effect is good. On the one hand, with the help of the teacher's well-designed outline, students can learn and test independently on their mobile terminal. On the other hand, the teacher can explore teaching innovation about teaching resource, teaching pattern, assessing ways and class roll call. The system is also suitable for other courses.