Abstract: Evaluating the regulation effect of regional coordinated development is an important and necessary way for achieving integrated regional development. Based on the quantification of China's regional economic coordinated development policy, this paper empirically tests the regulation effect and deep-seated regulation mechanism of China's regional coordinated development policy. The results show that:(1) China's regional coordinated development policy has relatively strong regional orientation, which is mainly toward the west, northeast and east regions. (2) At present, China's regional coordinated development policy can basically achieve the goals of narrowing the regional economic development gap and maintaining the efficiency of economic development. From the perspective of the four regions, the regional coordinated development policy can significantly reduce the regional differences in the east and west regions. At the same time, it has a relatively large promoting effect on the high-quality economic development of the east, west and central regions. (3) Under the regulation of regional coordinated development policies, the east and west regions focus on reducing their respective internal gap by raising the economic development level of "waist provinces" or "tail provinces", while the provinces in the central region show a trend of "going hand in hand".

Key words: regional coordinated development policy, high-quality economic development, regulation effect, regulation mechanism