The effects of irrigation levels and nitrogen rates on the growth parameters,yield and quality of rape were investigated in a pot greenhouse experiment.The results indicated that effects of irrigation levels and nitrogen rates had significant or very significant impacts on the leaf number,leaf area,chlorophyll content and yield.All these indexes increased with the increasing irrigation level.And significant parabolic relationship was found between nitrogen rates and these indexes,which reached the maximum at nitrogen rate of 0.1 g·kg-1and 0.2 g·kg-1,and there was no significant difference between the two rates.The high nitrogen rate combined with medium irrigation improved Vitamin C content of rape.Water soluble sugar and nitrate concentration were affected by both irrigation level,nitrogen rate and their interaction effect significantly.Enhanced irrigation decreased the negative effect of high nitrogen rate on the synthesis of water soluble sugar.Compared with the nitrogen application treatment,no nitrogen treatment showed a lower nitrate concentration.In addition,high irrigation level combined with low nitrogen rate as well as the nitrogen treatments under moderate irrigation regimes showed relatively lower nitrate concentration.In summary,the quality of rape was improved by properly lowering the nitrogen rate and increasing irrigation amount.The combination of medium irrigation and low nitrogen amount(75%of field water capacity,0.1 g·kg-1)was recommended as the optimum pattern for a comprehensive performance of the growth,yield and quality of rape.