A field experiment was conducted to study effects of fertilizer combination on yield,quality and forms of nutrients in leaf of lettuce.The results show that yield of lettuce was significantly increased(135.8% ~177.0% ) by balanced application of secondary-and micro-nutrient fertilizer and organic fertilizer in addition to N application at the same rate in CK.In terms of yield increment,the treatments were in the sequence of NP₁K₂MgZnB>NP₂K₂>NP₁K₂RM>NP₁K₂PP>NP₁K₂Mg>NP₁K₂>NP₂K₁.Nitrate contents of lettuce were reduced in all treatments.It was the most significant in Treatment NP₁K₂MgZnB and the least in Treatment NP₂K₂ in leaf,and the most in Treatment NP₁K₂RM and the least in Treatment NP₂K₂ in stem.Quality of the lettuce was improved in all the treatments and the most in Treatment NP₁K₂RM.In terms of forms of nutrients in the plant,protein-N,non-protein-P and non-protein-K dominate,respectively,in the lettuce leaf.Effects of fertilizer combination on forms of N and P nutrients in the leaf of lettuce differed from treatment to treatment but the effects of raising contents of the three forms of potassium were similar.Among the forms of nutrients,only non-protein-N showed a significantly negative correlat ion with nitrate in the stem of lettuce,but a positive one with Vc content in the stem and amino acid content in the leaf,non-protein-P showed a significantly negative correlation with Vc in the leaf and amino acid in the stem,and non-protein K and total K showed a significantly negative correlation with nitrate in the leaf but a positive one with Vc contents in the stem and leaf and amino acid in stem.Protein K showed a significantly negative correlation with nitrate in the stem,but a positive one with Vc and amino acid in the stem and leaf.