In order to explore the effects of water and nitrogen coupling on the yield, quality and water and nitrogen utilization of mountain apples under different irrigation technologies, a three-factor three-level orthogonal experiment was used with a total of 9 treatments, and each treatment was repeated 3 times. The three irrigation technologies were surge-root irrigation (S), ceramic infiltration irrigation (P) and surface drip irrigation (D), the three irrigation volumes were high water (H₁), medium water (H₂) and low water (H₃), and the three nitrogen application rates were high nitrogen (N₁), medium nitrogen (N₂) and low nitrogen (N₃). The response of mountain apple yield and water nitrogen use efficiency to water nitrogen regulation under different irrigation technologies was analyzed. The results showed that irrigation technology had a significant effect on fruit weight, vitamin C and fruit color (p＜0.05), and irrigation water volume and nitrogen application rate had significant effects on apple yield, fruit weight, fruit hardness, color, soluble solids, titratable acid, soluble sugar, vitamin C, sugar-acid ratio, nitrogen fertilizer partial productivity and irrigation water use efficiency (p＜0.05). Mountain apples treated with T₂ (SH₂N₂) had the highest yield (30 490.02 kg/hm²), T₅ treatment (PH₂N₃) had the highest nitrogen fertilizer productivity (104.66 kg/kg), and T₉ treatment (DH₃N₂) had the highest irrigation water use efficiency (70.81 kg/m³). The principal component analysis method showed that the optimal mode of water nitrogen coupling under different irrigation technologies was the combination of surge-root irrigation, medium irrigation volume (65%~80% θ_<em>f), and medium nitrogen application rate (400 kg/hm²) (T₂). The results of this study can provide scientific theoretical basis and technical support for the water and nitrogen management of apples in mountainous areas of northern Shaanxi.