Sweet corn is one of the main vegetable crops in Southwest China.At present，unreasonable phenomena such as excessive nitrogen fertilizer application，frequent fertilization and flooding after fertilization have significantly restricted the green production and high efficiency of sweet corn in Southwest China.In order to optimize the nitrogen management of sweet corn system in China，in 2018 to 2019 carried out a field experiment in Tonghai county，Yuxi city，Yunnan province，and explored the effect of applying a new nitrification inhibitor DMPSA in combination with nitrogen reduction on sweet corn yield，plant nitrogen absorption and nitrogen utilization efficiency.A total of five treatments were set up:no nitrogen fertilizer，farmers' habitual，and nitrogen reduction treatments combined with a new nitrification inhibitor DMPSA ammonium sulfate，calcium ammonium nitrate，and urea.The results showed that compared with the farmers' habitual treatment，the optimized fertilization treatment with the addition of a new nitrification inhibitor DMPSA stabilized the yield and yield components under the condition of reducing the amount of nitrogen fertilizer by 66.8%～76.8%，which was beneficial to promote plant dry matter weight and plant nitrogen absorption，and optimize fertilization treatment significantly reduced the nitrogen surplus by about 90% and significantly increased the nitrogen fertilizer partial productivity of 195%～210%，the nitrogen fertilizer agronomic effciency of 170%～240% and the nitrogen fertilizer recycling rate of 14.5%～20.3%.In terms of economic benefits，optimized fertilization treatment increased net income by an average of 2703 yuan/hm².There was no significant difference in yield, plant nitrogen uptake, nitrogen surplus and nitrogen utilization efficiency among different nitrogen forms combined with nitrification inhibitor DMPSA. In summary，the strategy of reducing nitrogen combined with DMPSA could stabilize the yield within the lower nitrogen fertilizer rate in sweet corn production，while taking into account the maximization of economic benefits and environmental friendliness，which will help to achieve green production of sweet corn.