Abstract：The interactive effects of light condition and nitrogen supply on yield and quality of tomato were studied with potted tomato.The results indicated that the effects of light condition，nitrogen supply and their interactions had significant influence on yield and quality.With the increase of nitrogen，the yield and nitrate content increased at first then decreased，and the contents of soluble protein and organic acid increased，soluble sugar content increased slightly then decreased in 100 % and 70 % light condition and decreased continuously in 50 % and 30 % light condition.With the increase of nitrogen，the VC content increased at first，then decreased in all light conditions，except decreased significantly in 30 % light condition.Light intensity significantly promoted tomato yield，the contents of VC，soluble sugar and soluble protein，but decreased the contents of organic acid and nitrate.Taken the yield and quality of tomato into account，120 kg·hm-2 was the appropriate nitrogen supply in 100 % and 70 % light conditions，0 kg·hm-2 in 50 % and 30 % light conditions.
