Abstract: Based on China’s water resources assessment and water resources bulletins, time series of precipitation, water resource, and water demand projection in base year were established, and the impacts of precipitation changes on water supply and demand in Haihe River region were analyzed by comparison in two phases namely 1956-1979 and 1980-2010. The results showed that the decrease of precipitation significantly reduces water resources 8.6 billion m³ and increases the amount of water demand 2.2 billion m³ annually during 1980-2010. Socioeconomic water scarcity caused by precipitation change is 7.7 billion m³, occupying 75% of the total water scarcity. The precipitation decreasing aggregates the conflicts between water demand and supply.

Key words: water supply, water demand, precipitation change, Haihe River region