Allocating cooperative supply cost to farmers involved in a fair and resonable way is the key to realize the cooperative supply of small-scale irrigations.Based on survey data from 890 farming households in Shaanxi province,this paper uses valuation method and cox proportional hazard method to analyze cost-sharing willingness and its main influencing factors of cooperative supply of small-scale irrigations.The result shows that farmer’s cost-sharing willingness is 36.7% in the total investment of small-scale irrigation.Farmer’s cognition of irrigations has the positive impact on cost-sharing willingness of cooperative supply of small-scale irrigations,followed by expected returns ratio,while the risk preference has little to do with cost-sharing willingness and farmer’s basic features also have significant impact on cost-sharing willingness.Therefore,this paper proposes several policy suggetions on how to build the income vision of small-scale irrigation cooperation,strengthen farmer’s cognition degree of small-scale irrigation facilities and establish perfect risk stress mechanism.