Abstract: Based on the precipitation variation during the recent hundred years in Shenyang, especially in the last five decades, the effects of precipitation on water resources were analyzed. The results show that the change of water resources is influenced by precipitation. Water resources gross decreases since 1956, and it changes with precipitation. The groundwater resources change gently. The change speed of the surface water resources is larger than that of precipitation. At the same time, the effects of precipitation on natural runoff in both Liaohe River and Hunhe River are obvious, whose inter-annual changes are strong. Precipitation decreases during recent decade in Shenyang, which will intensify the shortage of water resources. Finally, the trend of water resources is predicted based on the climatic prediction.