The glacier plays an important role in arid inland river basin by providing remarkable ecosystem services for basin development. However, the glacier area decreases rapidly under the influences of global warming, which weakens glacier ecosystem services. The changes of glacier area and glacier ecosystem services from 1964 to 2006 were analyzed. The results show that the value of glacier′s ecosystem services decrease rapidly during the period. The glacier area decreases from 557.1km2 in 1964 to 464.1km2 in 2006. The total value of glacier ecosystem services decreases from 1228.5×108 yuan in 1964 to 960.1×108 yuan in 2006. The glacier ablation alters the distribution of water resources in watershed and results in the decreasing of ecosystem services. The ecological effects of glacier ablation shouldn’t be neglected for watershed planning in the future.