Zhongguancun Science Park (ZSP) is the pioneer of science parks in China. The primary goal of this thesis is to find out the mechanisms of the hi-tech industrial cluster and the clustering process, which has realistic meanings to the promotion of ZSP. Abundant researches have been done on cluster, which is in contrast with the lack of a unified theoretical framework for exploring the clustering process. In an attempt to complement this neglected part, the paper investigates the clustering process and the engine behind it through the research on the two aspects of derivative effect in ZSP. As the largest sub-park of ZSP, Haidian Science Park (HSP) is selected to do deeper research to find out the internal partnerships, network of firms and the role of government. Based on the overall assessment of ZSP and the intensive study in HSP, constructive suggestions are given in the final part.