Abstract: The interface management between R&D/Marketing and R&D/Production is essential to commercialization of S&T achievements and success of technological innovation. It is, however, very difficult to evaluate levels of the interface management for an enterprise during its innovative process. The paper presents a gray cluster analysis with intervals, in order to assess the integration of interface management for the concerned firms. The proposed method, which can address the critical problems faced, has several advantages. First, it can quantify the impact factors on the interface and identify different perceptions of importance about the same factor between the two sides of the interface, too. It is also more facilitating to decide the evaluating standards by using the analysis technique than before. The interface between R&D and marketing in some typical firms is then empirically assessed to test the validity of the method. The results indicate the proposed analytic tool is indeed effective.