The addition of nitrification/urease inhibitors can achieve the purpose of reducing nitrogen and increasing efficiency in autumn potato production，which provided the basis for formulating autumn potato farmland nitrogen management measures and fertilizer saving and increasing efficiency strategies in farmland.In this study，a randomized block experiment design was used to investigate the effects of nitrogen application levels of 30，60，90 and 120 kg/hm² on soil mineral nitrogen content，photosynthetic capacity and yield of potatoes by four different ways:N-butyl thiophosphamide(NBPT)，dicyandiamide(DCD)，2-chloro-6-trichloromethylpyridine(CP)，and no added nitrification/urease inhibitors(CK).The results showed that nitrification/urease inhibitors significantly improved photosynthetic capacity，leaf aera and dry matter yield of autumn potato during tuber formation period .DCD，CP and NBPT increased autumn potato yield by 27.2% ～ 437.1%，8.0% ～ 212.8%，24.5% ～ 550.4%，respectively.Nitrification/urease inhibitors significantly increased yield of autumn potatoes under high nitrogen application level of 90 ～ 120 kg/hm²，but had no significant effect under low nitrogen application level of 30～60 kg/hm².Under the condition of 120 kg/hm² nitrogen，the effect of nitrification/urease inhibitor showed as NBPT>DCD>CP.