The influence of organic and inorganic fertilizers and DMPP addition on vegetable yield,quality and soil nitrate and nitrate leaching was studied under the conditions of equal nitrogen rate,in order to provide a theoretical basis for the vegetable safety production and environmental quality of groundwater protection.Three vegetables were planted continuously(swamp cabbage,amaranth and radish)inlarge undisturbed soil column system,and on the basis of the percentage of nitrogen amount in organic fertilizer to total nitrogen,8 fertilizer treatments were designed:no fertilizer(CK),pure chemical fertilizer(CF),30% organic manure+70% inorganic fertilizer(30%OM),50% organic fertilizer+50% inorganic fertilizer(50%OM),70% organic fertilizer+30% inorganic fertilizer(70%OM),pure chemical fertilizer+DMPP(CF+DMPP),30% organic fertilizer+70% inorganic fertilizer+DMPP(30%OM+DMPP)and 50% organic fertilizer+50% inorganic fertilizer+DMPP(50%OM+DMPP).Results showed that vegetable production had the tendency to decrease,when the ratio of organic manure was less than 50%,yield reduction was not obvious;at the same time,nitrate content in vegetable and nitrate nitrogen leaching loss were decreased with the ratio of organic manure increased,when 50% N was applied with organic fertilizer,compared to pure chemical fertilizer treatment,the average nitrate concentration in soil leaching water and leaching amount were significantly reduced by 29.29% and 25.39%,apparent nitrogen leaching rate and nitrogen apparent utilization rate were 8.82% and 22.60%,respectively.The influence of nitrification inhibitor DMPP on vegetables production and quality was changeable according to different vegetable and planting season.The reduction effect on soil nitrate nitrogen leaching was CF+DMPP＜30%OM+DMPP＜50%OM+DMPP,but the inhibitory effect of DMPP decreased with the increase of the proportion of organic fertilizer.The apparent nitrogen leaching rate and nitrogen apparent utilization rate in 50%OM+DMPP were 4.70% and 26.26%,respectively.During the planting period,the moisture input(irrigation and rainfall)for vegetables accounted for 49.82%( swamp cabbage),23.03%(amaranth)and 27.15%(radish)of the total water input,respectively.Water leaching amount accounted for 46.75%,19.66% and 33.59% of the total amount of leaching,respectively.Nitrate leaching amount accounted for 73.77%(swamp cabbage),2.31%(amaranth)and 23.92%(radish)of the total nitrate leaching,respectively.Our results indicated that considering of both vegetable quality and soil nitrate leaching amount,the best treatment was 50% OM+DMPP.Rainfall and fertilization are important factors for soil nitrate leaching,to apply organic fertilizer and DMPP reasonably according to vegetable growth characteristics can effectively counter the loss of nitrate leaching due to continuous rainfall.