Abstract: Improving the business environment is a realistic need to speed up the building of unified domestic market and realize coordinated and high-quality development among regions in the new era. It is also an inherent need to build a modern socialist country in an all-round way. This study constructs the evaluation system of business environment from six dimensions: market environment, government environment, commercial environment, open environment, legal environment and public service. Based on the entropy TOPSIS method, it measures and evaluates the comprehensive level of business environment in China's provinces during the 13th Five-Year Plan period, and analyzes the regional differentiation of business environment. The results are as follows: 1) The stability and volatility of the comprehensive evaluation of business environment in each province coexist. 2) There are significant provincial and regional differences in the comprehensive level of busine ss environment in each province, it presents the overall gradient evolution characteristics in time and space. 3) There is a large space for optimization between the business environment of each province and the ideal business environment. It puts forward some feasible suggestions for building first-class business environment, which includes establishing a multi-governance evaluation system based on government-market-society, identifying and making up for the sub-environment weakness of provincial-business environment, and focusing on narrowing the gap in the comprehensive level of business environment in the eastern, central and western regions.
