In order to study on the effect of partition leaching on soil salinity distribution in subsurface drains，field experiment was set up in typical experimental area selected from Coastal saline area.The simulation effect of HYDRUS-2D was verified by experimental data calibration，and salinity distribution of different partition leaching parameters was simulated by the validated model.The simulation results showed that HYDRUS-2D can well simulate the soil salt distribution under the condition of subsurface drains，and under the condition of uniform leaching，the soil salt distribution under the effect of subsurface drains was low in uniformity，the uniformity of soil salt leaching can be greatly improved by partition leaching.Among the 5 simulation scenarios，the soil salt leaching uniformity was the best under the F4 simulation scenario with the partition leaching and irrigation water ration.The difference between the maximum and minimum soil salinity in the 100cm soil layer was only 0.79g/kg.