The suitable nitrogen application rate is the key to combine potato higher yield，higher efficiency，better quality and ecological environment friendliness. Split-plot design was used to study the appropriate nitrogen application rates of different potato varieties in Lanxian county，Shanxi province. The main plot of the experiment were potato cultivars Jinshu 16 and Qingshu 9，and the sub-plot were five fertilization treatments，including T1:NE-N(N 0 kg/hm²，P2O5 90 kg/hm² and K2O 90 kg/hm²)，T2:M(commercial organic fertilizer alone)，T3:NE(N 180 kg/hm²，P2O5 90 kg/hm² and K2O 90 kg/hm²)，T4:NE+M(N 180 kg/hm²，P2O5 90 kg/hm² and K2O 90 kg/hm² + commercial organic fertilizer)，and T5:NE(N 270 kg/hm²，P2O5 90 kg/hm² and K2O 90 kg/hm²). Among them，NE represented the recommended amount of nutrients by Nutrient Expert. The results showed that:1)Cultivar and fertilizer significantly affected the nitrogen uptake，total tuber yield，commercial potato yield and commodity ratio. The average nitrogen uptake and total tuber yield obtained showed as cultivar Jinshu 16 < Qingshu 9，while the yield and its ratio of commercial potatoes were Jinshu 16 > Qingshu 9，and the T3 treatment of Jinshu 16 and T4 of Qingshu 9 produced the highest commercial potato yields，respectively. 2)Cultivar and fertilizer significantly affected potato quality，and the average content of tuber dry matter，specific gravity，crude protein and nitrate for cultivar Qingshu 9 were higher than those for cultivar Jinshu 16，while the average vitamin C content was lower than that of Jinshu 16. 3)The highest fertilizer use efficiency was obtained by T3 treatment，which was 41.7% and 43.3% for cultivar Jinshu 16 and Qingshu 9，respectively. The ratio of benefit and cost for Jinshu 16 was higher than that of Qingshu 9. Overall consideration for yield，quality，fertilizer use efficiency and economic return，the suitable rates of nitrogen fertilizer were 180 kg/hm² for cultivar Jinshu 16，and 227 kg/hm² for cultivar Qingshu 9，respectively. This study had certain guiding significance for the fertilizer management of potato crop in Shanxi province.