The monitoring data of the state-run monitoring sites of open ground vegetable fields in Xinjiang plain from 2014 to 2017 were used to study the characteristics of irrigation leakage and nitrogen （N） leaching loss in open ground vegetable fields under the different modes of water and fertilizer management in long term.The runoff volume and nitrogen leaching at a depth of 90 cm under conventional production mode， key mode of emission reduction （fertilizer application optimization）， and comprehensive mode of emission reduction （customary irrigation and N application） were analyzed.Results showed that the average annual water infiltration was 285.2 m³/hm²， the flow coefficient was 8.8%， and the total N leaching was 16.8 kg/hm² under the conventional production mode， which was 4.2% of the seasonal N fertilizer application including 6.3 kg/hm² of nitrate N， 0.16 kg/hm² of ammonium N and 3.32 kg/hm² organic N.Compared with the conventional production model， the key mode of emission reduction increased the yield by 4.0%， and reduced the runoff， the runoff coefficient and the total nitrogen leaching by 11.4%， 12.3% and 21.0%， respectively.The comprehensive mode of emission reduction significantly increased the yield by 20.6%， and reduced the runoff， the runoff coefficient and the total nitrogen leaching by 25.3%， 61.3% and 36.9%， respectively.It is indicated that the conventional production mode of open ground vegetables in grey desert soil area of Xinjiang lead to water leakage and nitrogen leaching loss.By reducing the amount of nitrogen application and improving fertilization methods， we can increase production and reduce irrigation leakage and nitrogen leaching amount.Reducing the amount of fertilizer application and irrigation at the same time can greatly reduce nitrogen leaching amount and increase yield.The key point is to reduce the amount of soil residual nitrogen in autumn to reduce nitrogen leaching loss caused by melting water in winter.