The paper studied the optimization of water resources allocation scheme in Karamay. Through establishing the model of water resources allocation of Karamay in 2005,it selected 13 programs to simulate water resources in Karamay;based on full consideration of society, economy, environment, resource utilization, the paper built the evaluation index system of water resources allocation scheme.by use of the analytic hierarchy process (AHP),it analyzed the weight each index and optimized water resources allocation scheme of Karamay in 2005. The results showed that the WRMM model is applicable to the allocation of water resources in Karamay, the results optimized by analytical hierarchy process is in line with the implementation program of water resources allocation in Karamay.