I. Introduction
The graduation thesis is the last link of assessment in Colleges and universities [1]. It not only tests knowledge and skills of students, but also examines the innovation ability and research ability of students, and the ability to solve practical problems [2]. At present, every link of graduation thesis is strict, such as guidance, review, reply and so on. And the links are divided and scored in detail [3]. The traditional evaluation method is that it calculates the scores and weights to guarantee the fairness in a certain extent. However, there is certain coupling between each link. If the weight is considered only, it will lose objectivity and persuasion. Therefore, a method will be found to resolve the existing problems in evaluation of graduation thesis.