Aiming at the serious problem of soil nitrate accumulation and leaching loss of facility vegetables，the effects of nitrogen reduction and straw addition on nitrate accumulation and leaching loss of facility vegetables were studied by using cucumber and eggplant as experimental crops in Ningxia Yellow River irrigation area.Field experiment，sampling，laboratory analysis and biostatistics were used to investigate the effects of different nitrogen management measures on soil nitrate accumulation and leaching loss in facility cucumber and eggplant cropping system by setting three treatments:farmer conventional fertilization (CON)，28% nitrogen reduction (RF) and 39% nitrogen reduction + straw addition (BMP). The results showed that compared with CON，RF and BMP treatments effectively reduced the nitrate accumulation in 0～120 cm layer soil，and the nitrate accumulation in cucumber in 2016，eggplant in 2017 and eggplant 2018 were reduced by 2.2%～9.4%，3.9%～6.1% and 5.2%～12.8%，respectively.The nitrate loss decreased by 55.6%～69.7%，59.4%～74.8% and 35.4%～48.9%，respectively.Compared with RF treatment，BMP reduced nitrate accumulation by 2.3%～8.1% and leaching loss by 20.9%～38.1%，respectively.There was a significantly positive correlation between nitrate accumulation and leaching loss (R2=0.6973).Therefore，on the basis of the customary fertilization of farmers in the vegetable field of Ningxia Yellow River irrigation area，nitrogen reduction combined with straw addition (BMP) was adopted，i.e.，39% nitrogen reduction for cucumber and its pure nitrogen content was 275 kg/hm² combined with 30.0 t/hm² corn straw，39% nitrogen reduction for eggplant and its pure nitrogen content was 319 kg/hm².With the addition of 30.0 t/hm² corn straw，the high yield could be obtained，the soil nitrate accumulation and leaching loss could be reduced，the risk of non-point source pollution of farmland soil could be reduced，and the economic benefit could be improved.Therefore，it is worth to be widely applied in the vegetable field of Ningxia Yellow River irrigation area.