Abstract: 【Objective】 To explore the effects of two fertilization devices, differential pressure fertilization and pumping fertilization, on nitrogen absorption, cotton yield and nitrogen use efficiency in drip irrigation cotton fields so as to provide theoretical basis for the development of water and fertilizer integration technology in drip irrigation cotton fields in arid areas of Xinjiang. 【Methods】 The three treatments were set up in the experiment:no nitrogen application(N₀), differential pressure fertilization device(N₃₀₀-differential pressure type)and pump-suction fertilization device(N₃₀₀-pump-suction type), in which the nitrogen fertilizer was ammonium sulfate, and the dosage was 300 kg/hm². 【Results】 Compared with N₀ treatment, N₃₀₀-differential pressure treatment and N₃₀₀-pumping treatment significantly increased cotton total biomass, nitrogen absorption and seed cotton yield.Compared with N₃₀₀-differential pressure treatment, N₃₀₀-pumping treatment had a more uniform distribution of ammonium nitrogen in emitter fertilizer solution, and the cotton biomass, nitrogen absorption, seed cotton yield and nitrogen utilization rate increased by 15.94%, 31.50%, 7.32% and 52.98%, respectively. 【Conclusion】 Under the same fertilization amount, the variation range of ammonium nitrogen concentration in emitter fertilizer solution of pump-suction fertilization device with time is smaller than that of differential pressure fertilization device.Therefore, the uniformity of fertilization of pump-suction fertilization device is better than that of differential pressure fertilization device, and the pump-suction fertilization device promotes cotton growth and significantly improves nitrogen absorption, thus increasing seed cotton yield and nitrogen utilization rate.