The campus business is an upgrade of the original school newsletter business, including basic business and value-added business. The basic business is the interactive business with campus home and school, and the value-added business includes the whole network products introduced from the platform of government and enterprise companies, as well as third-party applications and content resources. Interactive business with campus home and school is the basic business product of "Harmony with Campus" business. On the original basis, aiming at the triangle mode of "teacher+parents+students", the interaction between the class circle and the teacher's parents circle is strengthened, and the functions of class space, class group chat, peer-to-peer interaction and personal center are added. The campus value-added business products include: teachers, students and parents.