Defining proper process is an important way of improving software quality and development productivity. However, software process design is a common issue faced by many organizations. The introduction of process patterns provides an effective solution to the challenge. In previous studies, natural language is commonly employed to describe the context of process patterns, which not only decreases the accuracy of pattern selection made by users, but also goes against the implementation of computer aided experience extraction. Aiming at such a problem, we propose in this paper a quantitive context model of software process patterns and its corresponding application method. A concrete example is also presented in order to further illuminate our idea,. In the end, we briefly introduce the relative tool support in PKUPM (PeKing University Project Management).