The Pingyuan reservoir of xinjiang has been operating for many years science it was built, in order to understand the operation and current security situation of the project, this paper comprehensively analyzed the monitoring data of the dam operating for years conducted safety evaluation. Through the monitoring of dam deformation and seepage,it was gotten that the maximum vertical displacement of the dam is 1201mm,the replacement gravelly soil of dam base has good role on reducing dam settlement. The deformation dam body has stabilized; the seepage pressure potential of dam body and foundation decreases from upstream to downstream, and gradually decreases with time lapse.The penetration ratio of dam foundation is smaller.The effect of seepage_intercepting by cutoff seepage tank is good, which indicated that seepage is more stable.The results show that the work state of Pingyuan dam is good and able to meet the requirements of normal water use and safety operation.