As an integral part of the BeijingTianjinHebei water conservation functional area， the Yudaokou area of Chengde City is an important ecological support for the sustainable development of the region Based on the InVEST model(Integrated Valuation of Ecosystem Services and Tradeoffs)， this study quantitatively analyzes the temporal and spatial evolution of water yield and water conservation in Yudaokou area from 1990 to 2020， and uses scenario simulation to analyze and evaluate the impact of climatic factors and land use changes on water yield and water conservation The results showed as follows: (1) From 1990 to 2020， the average water production depth and water conservation depth in Yudaokou area were 103.26 and 81.66 mm respectively， and the water production and water conservation capacity showed a fluctuating trend of decreasing first and then increasing; The spatial distribution characteristics of them were high in the northeast and low in the southwest The high value areas were mainly concentrated in the northeast forest and grassland areas， while the low value areas were mainly concentrated in the unused land and the southwest cultivated land areas (2) Among the climatic factors， the water yield， water conservation and precipitation were positively correlated， while the potential evapotranspiration was negatively correlated; Among all land use types， the average water yield contribution rate of grassland was the largest (51.23%)， and the average water conservation contribution rate of forest land was the largest (50.77%) (3) From 1990 to 2020， the average annual contribution rates of climate and land use change to water yield change were 9499% and 501% respectively， and the average annual contribution rates to water conservation change were 92.21% and 7.79% respectively Climate change is the leading factor for the spacetime evolution of water production and water conservation function in Yudaokou area， while the impact of land use change is gradually increasing.