This study integrates the specifications and values of indoor air quality in foreign countries in detail, and after consulting relevant references, we analyze the appropriate methods to improve indoor air quality. The self-assembled gas monitoring instrument is equipped with a mobile phone or computer warning system. The experiment mainly focuses on the improvement of harmful gases CO2 and TVOC. It also measures indoor temperature and humidity and PM2.5, and the indoor gas concentration changes with the number of people in the teaching site. The test. Find out suitable ventilation methods in general classrooms and laboratories, put forward suggestions and methods that can improve the air quality in the classrooms, and summarize the factors that are harmful to air quality in general campus classrooms, and the indoor quality improvement methods proposed in this research Conduct verification and improvement benefits discussion.