Abstract: The air quality in the classroom has a huge impact on the learning and life of primary and secondary school students. In this regard, we analyzed the situation of indoor air pollution in the classrooms of primary and secondary schools. And the sources and characteristics of pollutants such as formaldehyde, benzene, toluene, xylene and ammonia in the air of primary and secondary school classrooms were analyzed separately. Based on the objective and somatosensory and psychological factors of the students in the classroom, a comprehensive evaluation model of indoor air quality in the classrooms of primary and secondary schools was established. According to the comprehensive evaluation model, the air quality in five classrooms of a middle school in Beijing is evaluated. After analysis, the evaluation results can effectively reflect the current air quality in the classroom.