Based on the data of eight core region in “Yiwu Business Circle”, this paper studies the regional economic convergence and the results are as follows: in the condition of sharing a large-scale market among different regions, it is easier to create an effective division of labor around the regional market based on their comparative advantage because of investment synergies and the following increasing returns generated by the continuous expansion of the market. With the outward transfer and proliferation of industries, the regional economy would develop towards the convergence under the interaction effect of market expansion and regional division. Key words: Regional sharing markets; Regional division; Yiwu business circle; Regional economic convergence