Abstract: Industrial cluster is a relatively geographically concentrated phenomenon, the causes and prospects of which have been drawing more and more attention. Chinese and foreign scholars have not yet made quantitative analysis on the mechanism of formation of industrial clusters. In order to study the causes and motives of the formation of industrial clusters as well as to reach quantitative results, the paper analyzed the process of regional spatial range of concentration of the logistics industry cluster based on transaction efficiency theory. After that, it revealed the motivation of logistics cluster based on the scope of economic principles - to share resources and commercial cooperation. Finally the paper used the Cobb-Douglas production function and the Solow economic growth model to analyze economic principle and optimal portfolio of the development of the logistics industry cluster. With the above three perspectives of analysis, tye paper obtained the necessary conditions as well as the internal and external factors for the formation of industrial clusters.