Abstract: The differentiation degree in test paper decides the test questions’ quality and the test’s effectiveness. Traditional differentiation degree in test paper adopts artificial visual observation method or high and low scores statistical discrete method, and so on. The test accuracy may be not high in these ways, or the operation process is very long. This paper proposes a method of Logistic model slope differentiation degree. According to the distribution of tester’s ability, its curve graph can be represented by VB program in the sensitive area of Logistic model slope, then it can obtain the test’s differentiation degree. It is concluded that regardless of operating speed or accuracy, it is much better than traditional statistical method.

Key words: degree of differentiate, difficulty, model, papers, program