The NPK ratio of water soluble fertilizer is the key factor affecting crop yield and quality.The experiment was carried out to investigate the effects of different nutrient ratios of water soluble fertilizer on yield,quality,nutrient absorption and fertilizer recovery rate of rape by potted planting methods.The results showed that compared with the treatment without fertilizer(water),water soluble fertilizer increased rape yield by 3.55~4.56 times.In different NPK ratios,the N∶P2O5∶K2O ratio of 1∶0.4∶0.8 was the best NPK ratio under this potted experiment conditions,which had the highest rape yield and highest fertilizer recovery rate,and the yield increased by 4.24% and nitrate content reduced by 27.38% than the traditional ratio T2(1∶0.5∶1).