In China, the statistics analysis literature of attainment level is mainly about students in middle school and high school, while, the undergraduates are neglected. However, undergraduates' attainment level has a significant impact on their academic roads and even the development of their careers. Therefore, universities require a reasonable evaluation system to quantify the undergraduates' attainment level. In this paper, we adopt the methodology of statistical analysis. First, the factors of influence on undergraduates' attainment level were analyzed and quantified. By using R-cluster analysis to classify the subjects, AHP to establish the weight factors, we finally made a comprehensive evaluation system. Through these simple and common statistical methodologies, as well as considering the learning achievement and scientific research ability via a comprehensive mean, this paper has a strong application value, which enables to provide the evaluation method of attainment level for undergraduates and provides reference value for university teachers for the students' attainment analysis and the adjustment of teaching plan.