This paper explains regional economic growth convergence based on the Short term and Long term from the new angle of view, and thinks that the divergence of regional economic growth takes on an inverted-U process. The analysis on regional economic growth of China after opening-up shows that regional economic growth of China is divergence in short term, and goes convergence in long run as long as taking effective measures. At last, this paper gives a model of regional economic growth convergence of China and makes a prediction.