Water resource appears the serious region difference between southern and northern part of China. The northern part belongs to the dry region which water is hard up; however, the supply exceeds demand that is the character of water resources in the southern part. Along with the economical development and the climatic fluctuation, the contradiction between the supply and demand for water resource in the northern part is gradually becoming serious, since 1980s. The trend of climatic fluctuation is represented by the decreasing precipitation and increasing temperature. The economical loss and the environmental degeneration become more obvious than ever before. The drought affects people's life and work seriously. Water transportation from south part to north part of China is a valid measure to resolve this problem. Through water transportation from south to north part of China, the contradiction involving water shortage could be solved. It could improve environment and accelerate the speed of social development. The change of soil moisture that influences on the local environment of meteorology is researched. The mode of MM5 is used to simulate, and the Oregon State University Land Surface Model(OSULSM)is selected as the land surface mode. It could be found that for the different seasons, with same amount of the initial soil moisture increasing, there is different range of increasing on the seasonal average soil moisture, and it is corresponding with the different range of changing on the precipitation and the ground temperature. For different seasons, with the same variety of soil moisture, the change is larger in the summer than that in the spring in terms of precipitation and the ground temperature.