Methods for screening winter wheat genotypes tolerant to low potassium level were studied by water culture and field experiments on a soil of low potassium fertility. It was observed that the amount of K absorbed was better than potassium utilization index when used as the screening index. The 1.0 mmol/L K concentration of the medium was found to be the suitable index at jointing stage of the plant. There was a significantly positive correlation between grain yield and the K content of shoot for 7 genotypes of winter wheat on the low-potassium soil (r=0.945^**,n=21). The amount of K absorbed by winter wheat was most from the non-exchangeable K of the soil that can not be extracted with lmol/L hot HNO₃ was the largest. The amount of K absorbed by winter wheat could also be used as a field screening index.