Five doors. According to the information in the official account of Tsinghua University WeChat, you can't fail more than five courses, but you can make up the exam and rebuild the system to remedy the failure. 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). It ranks among the national "double first-class", "985 Project" and "2 1 1 Project" and is selected as "201Plan" and "Everest Plan".