To study the difference of nitrogen efficiency of different potato varieties to provide reference for the cultivation of potato varieties with high nitrogen efficiency，field experiment was conducted by setting up two levels of nitrogen，which was low nitrogen(150 kg/hm²)and conventional nitrogen(300 kg/hm²)in 2016.The differences of nitrogen efficiency and its related indexes among 27 potato varieties were analyzed.The results showed that there were differences in the traits of potato varieties under two nitrogen application levels.Based on the average yield at low nitrogen level，average yield at conventional nitrogen level and average value of low nitrogen stress tolerance index，the nitrogen efficiency of the tested potato varieties was divided into 6 types:double high efficiency with low nitrogen tolerance type，double high efficiency with low nitrogen intolerance type，low nitrogen and high efficiency type，high nitrogen and high efficiency type，double low efficiency with low nitrogen tolerance type，double low efficiency with low nitrogen intolerance type. In 2017 and 2018，field experiments were conducted to further study double high efficiency low nitrogen tolerance type Jizhangshu 12 and double low efficiency low nitrogen intolerance type Youjia 70，and it was found that the nitrogen efficiency，dry matter quality in each growth period and nitrogen accumulation of Jizhangshu 12 were significantly higher than Youjia 70.This study can provide basis for the selection and utilization of potato varieties with high nitrogen efficiency and low nitrogen tolerance.