0000。 According to official website of Zhongnan University of Economics and Law, as of May 23rd, 2023, the borrowing card number of Xue Tong of Zhongnan University of Economics and Law is 0000, so it can be judged that this number is used to borrow books from the library. Zhongnan University of Economics and Law, located in Wuhan, Hubei Province, directly under the Ministry of Education, is a national "2 1 1 engineering" university and a key construction university in the "985 Engineering Advantage Discipline Innovation Platform" project.