No, according to the information of official website of Peking University in 2022, outstanding students in summer schools did not lose their marks. Peking University, abbreviated as "Peking University", is located in Haidian District, Beijing. It is a national key university directly under the Ministry of Education of People's Republic of China (PRC), and ranks among the "Double First Class", "2 1 1 Project" and "985 Project".