| In this study, 12 potato varieties were used in 2 consecutive years in 2022 and 2023, and two levels of no nitrogen application (0 kg·hm-2) and nitrogen application (180 kg·hm-2) were set to study the characteristics of potato yield and water\|nitrogen efficiency of different varieties. The method of affiliation function for a comprehensive evaluation was adopted. The results showed that variety, nitrogen level, and variety × nitrogen level all had highly significant effects on late\|maturing potato yield, while variety × nitrogen level had no significant effect on medium\|maturing varieties.Yield variations ranged from 8 289.39 kg·hm-2 to 22 011.61 kg·hm-2 for medium\|maturing varieties and 8 192.57 kg·hm-2 to 20 308.58 kg·hm-2 for late\|maturing varieties under 2 consecutive years of N supply. Based on the average yields of each variety of potato under 2 years of nitrogen application and no nitrogen application conditions, different nitrogen\|efficient varieties of the potato were classified into double high\|efficiency type (‘Jingzhangshu 1’, ‘Longshu 20’, ‘Qingshu 9’, ‘Longshu 15’, ‘Longshu 16’), low\|nitrogen high\|efficiency type (‘V7’, ‘Longshu 14’), high\|nitrogen high\|efficiency type (‘Longshu 10’), and double\|low\|efficiency type (‘Jizhangshu 12’, ‘Xisen 6’, ‘Dingshu 3’, ‘Longshu 22’). Correlation analysis showed that nitrogen uptake efficiency, apparent utilization rate of nitrogen fertilizer and yield had highly significant positive correlation (R2=0.4438**, R2=0.4211**), and there was a highly significant positive correlation between potato yield and nitrogen content of tubers (R2 = 0.5302**, R2=0.4357**), indicating that the higher the nitrogen content of potato tubers under the conditions of nitrogen application and no nitrogen application, the higher its yield. The analysis of the affiliation function showed that the medium\|maturity variety ‘Jingzhangshu 1’（Di=0.90）, the late\|maturity variety ‘Qingshu 9’ （Di=0.90） and ‘Longshu 10’（Di=0.87） had higher comprehensive water and nitrogen utilization efficiency and yield performance, which can be recommended as water\| and nitrogen\|efficient varieties in the Longzhong dry farmlands. |