Abstract: In order to find out the current situation of water and sand evolution in Qiaozigou comparative typical sub-watersheds in the "Three Hills" of the Loess Plateau and to better predict the future water and sand changes in the region, this paper adopts the methods of comparative analysis, correlation analysis, and construction of water and sand prediction regression model to study the land use and spatial changes in the watersheds in the Qiaozidonggou and Qiaoxidonggou areas. spatial changes, precipitation, runoff sediment changes during the 33 a period from 1991 to 2023, and selected to construct a quadratic polynomial stepwise regression model for water and sand at different scales by model applicability comparison. The results showed that: 1) as of 2022, the degree of governance of Qiaozidonggou and Qiaoxidonggou watersheds was 92.65% and 88.07%, respectively, and the land-use structure of Qiaozidonggou watersheds showed a gradual improvement; the precipitation amount and the number of days of precipitation in Qiaozidonggou watersheds showed fluctuating changes with an overall increasing trend during the period of 1991-2023, and the percentages of the flood season precipitation and the number of precipitation days in the inter-annual precipitation and the number of days of precipitation respectively, with 2014 as the inflection point of change, and runoff and sand transport were normally distributed over time, with the peak interval of 2003-2013; 2) the quadratic polynomial stepwise regression model can scientifically describe the relationship between sand transport and various factors of precipitation and runoff in Qiaozigou comparative subwatersheds (<italic>R_i²</italic>≥0.9721); 3) under the case of inter-annual precipitation, sand transport in the Qiaozigou East Gully and West Gully watersheds' main influencing single factors of sand transport are x₃ and x₄, respectively, and the interaction factors are x₁x₃ and x₂x₄, respectively; in the case of flood season precipitation, the main influencing single factors of sand transport in the Qiaozidonggou and West Gully watersheds are x₃ and x₄, respectively, and the interaction factors are x₃x₆ and x₄x₆; the simulation of the watershed's sand transport is better (<italic>R²</italic>≥0.9449), and the correlation between the water and sand indexes is is significant.