Digital education has recently become a mainstream education model. Despite digital education's increasing popularity, there remain issues when it comes to teacher-student interactions in digital space, which have made it impossible for this model to achieve the same teaching quality as traditional in-person education. Compared with other academic subjects, online courses in design practice have even more severe problems with teacher-student interaction. This study proposes a new teaching interaction assistance model in online design practice courses. The model uses the TAPs method to establish evaluation codes based on students' design thinking as well as through feedback-thinking related codes. This teaching interaction assistance model is established by combining these thinking codes and the LSTM model. This study takes an online design practice course as a case study, and the results have shown that this model can help teachers and students communicate more effectively and improve the teaching quality of online design practice courses.