Classin is an APP specialized in online classrooms. It was developed and launched in 2015 by its parent company，EEO Education. At present，the software has become one of the most popular mainstream platforms for online teaching. Because of its unique software design and novel functions，Classin gives teachers and students who take classes through its online platform a similar to offline teaching experience. In terms of product promotion strategy，Classin focuses on connotative development，emphasising product R&D investment. Since the breakout of Covid-19，Classin ushered in a godsend opportunity of demand blowout，but at the same time it is also faced with the challenges of excessive growth of the company，thresholds within the system，and the curse of payment.