Abstract: Based on the climatic law of the Sanjiang Plain,the following suggestions on the rational development and administration of the region were pointed out. They are (1)to fertilize the existing farmland to increase yield of unit area as the agricultural direction in the future because of rich light energy resource and great production potenfial;(2)to carry out the lpolicy [regulating rivers and watercourses bringing waterlogging and draught under control and [combining draingge with storage in view of the ratio of precipitation and possible evapora-tion and unsteady precipitation;(3)to distribute rationally crops and variety to prevent low temperature hazard according to the thermal condition;(4)to take the measures to make the change of the ecological environment in good circulation because recently soil erosion becomes serious.