Abstract: With soybean variety Jidou 17 as the experimental material, the field experiment was conducted at Dahe Experimental Station of Hebei Academy of Agriculture and Forestry Sciences to analyze the effects of different N,P,K levels on soil nutrient content, yield, components of soybean yield and quality during summer soybean harvest, so as to determine the effects of different N,P,K levels on the yield and quality of summer soybean in Hebei. The results showed that: During the harvest period, the contents of available N, P and K in 0-20 cm soil layer were 7.55-9.62 mg·kg^-1, 14.0-27.2 mg·kg^-1 and 139-218 mg·kg^-1 respectively. Compared with no fertilization treatment, N, P and K application increased nitrate-N, available P and available K in 0-20 cm soil layers by 16.8%-25.2%, 34.3%-93.6% and 18.7%-62.6% respectively. When the soil available N content was low, N application significantly increased the effective pods number per plant, seeds number per plant and soybean yield by 15.6%-43.8%, 13.7%-42.8% and 12.2%-29.4% respectively, and soybean yield was significantly positively correlated with N application(0-195 kg·hm^-2). N application increased the protein content of soybean seeds by 1.31%-3.39%, and decreased the fat content by 2.55%-3.40%. With the increase of N application rate, the protein content of soybean seeds increased firstly and then decreased. When the content of available P and K in soil was at medium or above level, the number of effective pods number per plant, seeds number per plant and yield of soybean increased by 7.57%-10.3%, 2.70%-6.31%, 1.56%-4.34% and 1.06%-1.69%, 1.83%-7.34%, 6.03%-6.81% respectively with P and K application. The soybean yield increased firstly and then decreased with the increase of P application, P and K application had no significant effect on protein and fat content of soybean seeds.