Yes According to official website of Beijing Education Bureau, we know that winter classes in Tsinghua and Peking University need invitation codes to register. The invitation code is issued by the school admissions department or the relevant person in charge, limiting the number of applicants and ensuring the quality of the activity. Tsinghua University, abbreviated as "Tsinghua", located in Haidian District, is a national key university directly under the Ministry of Education of People's Republic of China (PRC).