according to daily evaporation and meteorological data during non-glacial period of 2007from Qiemo meteorological station in Che''erchen River basin of Xinjiang (April to September), the paper used neural network- the default factor method and entropy method to analyze the influence of meteorological factors on water evaporation. Results show that temperature and wind speed is the most sensitive factors on the influence of water surface evaporation. Hope from meteorological factors point of view, to provide reference for regional water resources optimal allocation.