Abstract：This paper discusses in more detail the determination of objective weight-values in the comprehensive evaluation of mine environmental geological problems. It introduces the method of objectively determining the weight-values of the evaluation index by using the data of the mine environmental geological investigation database and the method determining the weight-values of the evaluation index by expert questionnaires. The two methods are compared and analyzed, and with the help of examples, the applicability and credibility of the methods of comprehensive evaluation by using the objective weighted values to evaluate mine environmental geological problems are dealt with in an attempt to lay a preliminary theoretical basis for carrying out mine environmental geological comprehensive evaluation in China and preparing maps.