May to June. According to official website of Sun Yat-sen University, the annual doctoral political examination and file transfer time of Sun Yat-sen University is from May to June each year. According to official website, Sun Yat-sen University Graduate School, Sun Yat-sen University graduate files are retrieved from May to June every year. Sun Yat-sen University, referred to as CUHK for short, is located in Guangdong Province and directly under the Ministry of Education of People's Republic of China (PRC). It is a comprehensive national key university jointly established by the Ministry of Education, the State Bureau of Science, Technology and Industry for National Defense and Guangdong Province.