The regional disparity of economic growth in China is increasing since the reform, and the convergence effects of population mobility on the regional disparity are obvious, The article uses a econometric model about population mobility and economic growth to show the disparity of population mobility has significant influence on that of economic growth, and the factor of undifferentiated movers have no notable effect on that growth in the model, but, it is known that movers have made significant contribution to the local economic development although this contribution tends are decreasing. The paper also finds that Chinese economic growth is conditional convergence in the fist ten years of reformation, but this tendency disappears after 1990, and the conclusion is suitable for the convergence mechanism of the interior of east, west or midst areas.