2 years, 10 years, or 20 years. According to the Regulations on the Confidentiality Management of Postgraduate Dissertations of the University of Science of China, the confidentiality period of known confidential dissertations is generally not more than 2 years, the "secret" is generally not more than 10 years, and the "secret" is generally not more than 20 years. Therefore, the confidentiality period of HKUST is 2 years, 10 years, or 20 years. China University of Science and Technology (USTC) is located at No.96 Jinzhai Road, Hefei City, Anhui Province, also known as China University of Science and Technology. The school was founded in September 1958, with its original address in Beijing, and its first principal was Guo Moruo. 1970, China University of Science and Technology moved from Beijing to Hefei.