Diploma and degree certificate. According to official website of China Geo University, China Geo University is located in Wuhan, Hubei Province. Double certificate refers to the graduate certificate of China Geo University and the master's degree certificate of students' major. China Geo University is a national key university directly under the Ministry of Education, a graduate school approved by the state, a national "2 1 1 engineering" and a national "double-class" construction university.