Abstract: Based on fuzzy mathematics theory and three aspects of environment，economy and society affecting agricultural water price were considered，five factors such as water quality，water resources，per capita disposable income，technical cost investment and farmers′ satisfaction were selected，fuzzy mathematics comprehensive evaluation model was established and applied to practical engineering.Estimated agricultural water price was 0.99 yuan/m3 by taking a large irrigation area in Yunnan as an example，and price gap was larger than current water price of 0.08 yuan/m3.Therefore，agricultural water price should be raised within acceptable range of farmers.Reasonable agricultural water price could reduce waste of agricultural water resources and improve utilization ratio of water resources，which is of great significance for realization of agricultural water saving.