In order to elucidate the relationship between soil salinization and groundwater, soil texture, soil solution and groundwater were examined in a non-saline field and a saline plot next to it in the Yellow River basin. Hydraulic constants of the aquifer also were determined by the pumping-out test. Contents of silt and clay in the surface soil, and contents of Na^+ and SO_4^<2-> in the soil solution were larger in the saline plot than in the non-saline field. These characteristics tend to cause poor drainage. Furthermore, it was supposed by the pumping-out test that both transmissibility coefficient and storage coefficient were small in the saline plot, as compared to the non-saline field. This means that soil pores in the saline plot are smaller and more uniform than those in the non-saline field, and is good for transporting salts upward from the water table by capillary action, but not good for leaching out salts from the soil profile.