Abstract: Focused on the nitrogen pollution of the groundwater and river and ground surface of Shenyang Hun river water source area, Hydrus -1D was used to obtain the water volume and nitrogen concentrations at the bottom of the unsaturated zone, which can be considered to represent the regional results as initial values of the aquifer model built by Visual Modflow, which was used to simulate the nitrogen migration and transformation, and these can combine the simulation in top soil, unsaturated zone and aquifer together. In addition, compared with the groundwater sampling test results, the simulating and calculating results mentioned above were used to calculate the contribution rates of various groundwater nitrogen pollution sources by equilibrium formulas. The conclusions suggested that ammonia nitrogen in the southeast part was mainly from Hun River, and the contribution rate was 61.79%;Nitrate nitrogen in the northwest part was mainly from top soil vertical infiltration, and the contribution rate was 43. 92%.