Abstract: Actually,there is inevitability that the regional GDP flows among the some regions. Based on the historical regional GDP data, the article focuses on characteristic and reasons of the inflow and outflow of all regions, researches the relationship between the gap of regional development and the flowing of regional GDP. The major reviews and conclusions are follows ： First, the sum of the net outflow of all regions roughly equals to the net export in national level. Secondly, there is obvious regular of the pattern of regional GDP flows. Thirdly,there are three factors infecting the regional GDP flows, including the situation of import and export whole country; the level of the development of regional economy; the structure of industries.