Regional sustainable developments in China need not only to pay attention to the integrated developments in the easterm and western part of China,but also to coasider the coordinating disparity in the southern part and northern part of China.The South North regional economical development has a disparity,which was resulted from the disproportion and compliacty of various facts in nature,economy and social history.For that,the Complementarity of the South North regional economical development should be strengthened,which are the important countermeasures that coordinating development of Chinese regional economy must select.