Chengyitong School is an online education company established on 20 14, which mainly provides language learning, skills training, academic education, vocational training and other services. Its Yijing lecture hall received rave reviews, and the knowledge of Yijing taught by training institutions was straightforward, concise and clear, which was deeply loved by students. The teaching style is humorous and vivid, and rich cases and interactive forms are used to make the learning process more interesting and substantial.