This study was carried out to investigate the effect of nitrogen，phosphorus and potassium fertilizer application on welsh onion yield，nutrient absorption and fertilizer utilization efficiency，aiming to provide scientific fertilization technology for welsh onion.Field experiments of four sites were conducted in Zhangqiu，Shandong and welsh onion cultivars ‘Dawutong’ of Zhangqiu was selected as test materials.There were six treatments were set including optimized fertilization(OPT)，OPT with no nitrogen fertilizer(OPT-N)，OPT with no phosphate fertilizer(OPT-P)，OPT with no potassium fertilizer(OPT-K)，OPT with organic manure(OPT+OM)and farmer practice(FP).The results showed that compared with FP treatment，the optimum N，P and K fertilizer rates were reduced by 13.3%，24.4% and 17.5% respectively，while the yields of welsh onion had no significant differences.The contributions of inorganic fertilizer of nitrogen，phosphorus and potassium to the production were 22.2%，10.7% and 17.5% respectively.Optimized fertilization increased the nutrient absorption amounts compared with the PF and the uptake of K in plant was significantly increased by 17.7%.The fertilizer use efficiency of nitrogen，phosphorus and potassium was about 23.5%，13.4% and 29.6%，the agronomic efficiency was about 53.8，57.1 and 44.1 kg·kg-1，and fertilizer partial factor productivity was about 272.0，527.2 and 268.8 kg·kg-1，respectively.In conclusion，the balanced fertilization for welsh onion based on soil fertility and the target yield optimized the ratio of nitrogen，phosphate and potassium fertilizer，and increased the value cost ratio with the more nutrients uptake.The treatment of adding organic manure which reduced 30% nitrogen based on balanced application of N，P and K fertilizer had good effect，and it is worthy of popularization and application.