利用天山西部地区9个县市气象站近50年的降水、气温和水面蒸发观测资料，分析了天山西部地区干旱指数与干燥度的关系，并推导出利用降水和气温资料计算E601型蒸发器观测值表示的水面蒸发量的方法。结果表明，天山西部地区代表站年以及春、夏、秋三季干旱指数与干燥度的相关性十分显著，因此可以利用年降水或春、夏、秋三季降水和平均气温资料计算相应水面蒸发量的经验性模型。通过对各代表站水面蒸发量的拟合检验计算，单站模型和5站综合模型拟合结果均符合《水文情报预报规范》有关规定和技术标准，因此推导的计算方法具有很好的实用价值。

The 50-year precipitation, temperature, and water surface evaporation data at nine the use of Western Tianshan area 9 county meteorological stations nearly 50 years of precipitation, temperature and evaporation observation data, of western Tianshan area were used to analyze analyzes the relationship between the drought index in West Tianshan area and dryness in the area, and to deduced the calculation method of water surface evaporation based on theof observed values of E601 evaporator observation value using is represented by the precipitation and temperature data. The results showed that ,the relationships between the annual and seasonal (spring, summer, and autumn) drought indexes and drying indexes are significant at the representative stations of western Tianshan area, which indicates that the annual and seasonal (spring, summer, and autumn) precipitation and average temperature data can be used to Western Tianshan area representative station and the relationship between the spring, summer, autumn three season drought index and dryness are good and very significant, can be used to calculate the corresponding empirical model of water surface evaporation is established by year or spring, summer, autumn three season precipitation and average air temperature data. Based on the verification calculations of water surface evaporation values at each station, the models of single station and five integrated stations can generate the results satisfying the regulations and technical standards of “Standard for Hydrological Information and Hydrological Forecasting”. Therefore, the calculation method is of practical significance. By fitting the test surface evaporation of each represent station calculation, single station and 5 station integrated model fitting results are in line with the "norm" forecast hydrological information and relevant regulations and technical standards, the calculating method has very good practical value.