Ningbo has no after-sales business hall. The electronic student ID card is handled through Ningbo Education Bureau and school management platform and provides after-sales service. There is no after-sales business hall offline. Based on wireless communication and combined with service management platform, electronic student ID provides information sharing platform for schools, schools and parents, and realizes grid big data management, thus improving the construction of teaching facilities, pooling all kinds of resources, reducing teachers' pressure, improving students' safety, and parents can keep abreast of students' trends and build a management system of the whole safe campus.