Abstract:After reviewing the development of the complexity study, this article introduces the basic concepts and recent research in complexity study. Then, on the basis of analyzing the configuration complexity model and the complexity model in the process of IT management, it illuminates the ways to determine the complexity values in these models and lists the four steps of the quantification in configuration process with the configuration complexity model. Moreover, performance prediction in configuration process is explained. At last, it points out the existing problems and future research orientations.