Log in to Jinyun APP, select Microvision in the menu bar at the top of the homepage, and then select the cloud classroom of Grade Three or Primary School or Grade Three according to your age. "Broadcast Cloud Classroom" is an online classroom learning platform in Tianjin during the epidemic period. The first stage of the project is specifically aimed at students in Grade Three and Grade Three. The online special review tutorial class is recorded by famous teachers from various disciplines organized by the Municipal Education Commission, and each class is lectured by two outstanding teachers with senior titles or above, and each class lasts for 45 minutes. The second phase of the project will expand the audience of students and increase the grade of primary school, with each class lasting more than 20 minutes.