As a kind of large-scale standardized test, the College English Test Band Four and Six (CET 4/6) can evaluate the English level of the students through its detailed test content. How to calculate and estimate the relationship between the pass rate of CET 4/6 and the English level of the students has been long concerned by the teaching staff and related teaching administrative personnel. This paper will analyze the grades of CET 4/6 over time and explain the scores, and then utilize the fuzzy theory to do the multiple objective fuzzy assessment and combine the experts’ experience, so as to build evaluation mathematical model of pass rate of CET 4/6 and the English level of the students. Through the forecast of the CET 4/6 grades and the analysis of the English skills of the students, this paper can validate the accuracy of the model and analyze the advantages and disadvantages of the CET 4/6.