Based on the 7year field experiment,the effects of different nitrogen rates of chemical fertilizers combined with organic fertilizers on the tomato yield,quality,nitrate accumulation,soil electrical conductivity and soil pH were studied under the conditions of drip irrigation and fertilizer integration.The results showed that：1）Compared with no nitrogen fertilizer,fertilization could significantly increase the yield of tomato,but overfertilization will not only decrease the yield of tomato,but also reduce the quality of tomato;2）Nitrogen application had a greater effect on nitrate accumulation in soil,with the increase of nitrogen application,the accumulation of nitrate nitrogen in soil profile increased,and the effect on nitrate accumulation in 0~20 cm soil layer was the most significant;3）Soil nitrate nitrogen content and soil conductivity was highly significant correlated,indicating that the higher nitrogen application,the more significant of the conductivity increase,and the higher the risk of soil secondary salinization;4）In addition to CK treatment,the contents of nitrate nitrogen in other treatments showed extremely significant negative correlation with pH value.Considering the yield,quality and soil environmental quality,it was recommended that the application of 200 kg/hm2 organic N+250 kg/hm2 inorganic N,P2O5 75 kg/hm2,K2O 450 kg/hm2 was appropriate.