In order to study the effects of processing tomato on nitrogen absorption and utilization，nitrogen nutrition index (NNI)and nitrogen deficit(Nand)under the fertilization scheme based on the critical nitrogen concentration model，the processing tomato variety“liger 87-5”widely planted in Xinjiang was selected as the research object，and four nitrogen application levels were set:no nitrogen(N0)，200 kg·hm -2(N1)，300 kg·hm -2(N2)and 400 kg·hm -2(N3)by fieldexperiments.The results showed that the dry matter accumulation of 300 kg·hm -2treatment was thehighest，and 400 kg·hm-2treatment did not promote the dry mattercontent.The nitrogen concentration increased with the increase of nitrogen application on each samplingday，and decreased with the advance of growthperiod.The nitrogen uptake of 300 kg·hm -2 treatment was the highest in the seedling stage，which was 289.49 and 263.59 kg·hm -2in two years，respectively. With the development of the plant，the nitrogen accumulation transferred to the fruit，and the nitrogen transfer of 300 kg·hm-2treatment was the largest.In the seedling stage of processing tomato，the treatment of applying 300 and 400 kg·hm-2led to excessive nitrogen in the field of processingtomato.The NNI of 200 kg·hm -2treatment was close to1，and the Nand was no significant difference among the treatments.The NNI of 300 kg·hm -2 treatment was close to 1 and the Nand was close to 0 after floweringperiod.The best total amount of nitrogen application for drip irrigation processing tomato in Xinjiang is 278 kg·hm-2.The proportion of nitrogen application from seedling stage to floweringstage，from flowering stage to fruit settingstage，from fruit setting to red ripening stage and from red ripening to seedling pulling stage is16%，26%，49% and9%，respectively.This scheme provides technical support for the full utilization of nitrogen and the continuous high yield of processing tomato.