Abstract: There are two criteria to measure the scale of commerce in a country: the ratio of commercial employed population to the total population of the nation and the ratio of commercial employed population to total employed population of the nation. The broadening space of commerce is still large in China if this question is viewed by international comparison. Commerce is both the precursory industry of the national economic development and the barometer of market changes. The development of Chinese commerce should follow a way of Cooperative Competition to make full use of stock commercial resources and increase the ratio of commercial employments to the total population. Let's make the commercial cake bigger so as to provide more employment opportunities