At present, 2 1 Century Education Network has more than 5 million registered members to upload materials, and at the same time, it has more than 500 first-line special senior teachers distributed all over the country to strictly review and maintain the uploaded materials, thus ensuring the quality of the materials. At present, it has 5 million sets of materials, with a capacity of more than 2T. The resources are enriched by excellent front-line teachers at the rate of not less than 3,000 materials per day.