Basing on statistical data, the author reviewed the differences between the north and the south in economic rate and level and analysed regional unbalanced development in China Through quantitative calculation, the conclusions are drawn: 1)it was obvious that the south was faster than the north; contrast of economic level has reversed since reform and opening 2)The reasons accountable for these changes consist of politics, export strength,economic system (structure of possession system),input intensity (special foreign direct investment), industrial structure and so on 3)Social cultural elements have certain influence by all means 4)To turn the north tardy, we should quicken the pace of reform and opening in the north, make efforts in restructuring big and middle state owned enterprises, vigorously carry out the strategy of making the country strong through science and education 5)The north must grasp opportunity, build new economic growth pole, retransfer and upgrade industrial structure as soon as possible