The video of Chongqing Academy of Educational Sciences' excellent course was watched in Chongqing Cloud Classroom. According to relevant public information, the Notice of Chongqing Academy of Educational Sciences on Developing High-quality Micro-course Resources shows that all resources and public welfare are open to ordinary primary and secondary schools, kindergartens and secondary vocational schools in the city free of charge. Through Chongqing Cloud Classroom, teachers, students and parents in the city log in to the cloud classroom, register with their mobile phone numbers, log in to study or organize study.