Based on the upper-air data of Dari, Hongyuan and Hezuo and data of g round meteorological station over Dawu, Jiuzhi, Gande, Maqu, Dari, Henan, Tongde , Zeku, Banma and the center station of upper stream of Yellow River, this paper a nalyzed the moisture flux divergence in this area. The result shows that the pre c ipitation enhancement in the area is favorable due to the higher moisture and co nvergence of moisture transport, and also made easy to increase electric prod uctivity and the economic development of west China.