The quality of postgraduate students is directly related to the quality of postgraduate training in colleges and universities, and also affects the level of discipline construction in colleges and universities. In recent years, with the continuous increase in the scale of enrollment for postgraduate students, how to increase the proportion of high-quality postgraduate students has become particularly important for the training of talents and the development of disciplines in higher colleges and universities. This paper takes the School of Mechanics and Civil Engineering of China University of Mining and Technology as an example. Based on the data of master student source of this school in 2016-2019, the registration status of master graduate students in various majors is analyzed, and the proportion of high-quality students and the characteristics of the source structure of graduate students were discussed. The countermeasures to improve the quality of graduate students are put forward, which can provide important reference value for the enrollment of graduate students in similar universities in the future.