Commerical economic region(CER),or commerical geographical region,is the result of socialized production and development of commodity economy,characterized by system holisty,regional independence, interregional openness and relative steadiness. Commercial economic regionalization provides a scientific basis for organizing and building a commodity circulation network system with all directions,multifunction and openness,rational planning the direction of commodity flow. The principles of commercial economic regionalization are as follows:1.the principle taking a city business center as the core;2.the optimization principle of integrated function;3.the difference principle of physical geographical environment;4.the uniformity principle of human geographical environment;and 5.the order principle of dissipative structure. According to the above-mentioned principles,China’s CER can be divided into 4 levels.