Full surname+ID number, date of birth. According to the announcement issued by the Student Affairs Office of Lanzhou University, the account number of freshmen in Lanzhou University is Pinyin Abbreviation++@lzu.cn, and the initial password of the mailbox is the full spelling of the student's surname+ID number and date of birth. Lanzhou University is a national key university directly under the Ministry of Education of People's Republic of China (PRC). Directly under the central government, it is established by the State Bureau of Science, Technology and Industry for National Defense and the Ministry of Education.