In this study，a field experiment was conducted to investigate the effects of nitrogen(N)fertilizer forms and N transformation process regulation measures on potato yield，nutrient accumulation and N use efficiency(NUE).The treatments were treated with different rates of ammonium fertilizer(AF，225.0，168.8 and 112.5 kg/hm²)± nitrification inhibitors(dicyandiamide，DCD)，nitrate fertilizers(NF，225.0，168.8 and 112.5 kg/hm²).The results showed that，compared with NF treatments，AF significantly improved potato yield and N uptake.The yield of potato was increased with the increasing of AF rates，but showed no change with NF rates.Compared with AF or NF，the combined of DCD with AF increased the yield of potato too.There was a significant positive correlation between potato yield and soil ammonium nitrogen content.The results of this study indicated that N form coupling could promote crop growth，which can provide basic theory for improving crop NUE and reduce N losses.