The experiments were conducted to evaluate the effect of two different irrigation treatments, Irrigation levels and Irrigation methods on yield, quality and chemical composion of potato plant (Spunta cultivar), during the seasons of 2020 and 2021. The experiments were conducted at Baloza Research Station, Desert Research Center, North Sinai Governorate, Egypt. The experimental design was a split plot design with three replicates, every replicate included 8 treatments which were the combinations between two drip irrigation mthods (subsurfac drip irrgation SSD and surface drip irigation SD ) and four irrigation levels (40%, 60%, 80% and100% of ETo) . The results in the two experimental seasons showed that application of different irrigation levels and irrigation methods treatments affected significantly potato yield, quality and chemical composion. The use of irrigation level 100% of ETo resulted in significantly higher values of potato yield quality and tuber chemical composition, also using subsurface drip irrigation method treatment increase the potato tuber yield quality and tuber chemical composition. Regarding the interaction between irrigation levels and, the highest results of potato tuber yield, quality and tuber chemical composition were obtained by the irrigation level 100% combined with subsurface drip irrigation. The irrigation level 80% treatment was obtained the highest WUE followed by irrigation level 100% treatment, on the other side the sub-surface drip irrigation method SSD was obtained the highest WUE than surface drip irrigation method SD. Regarding the interaction between irrigation levels and irrigation methods treatments, the highest WUE were obtained by SSD with 80% followed by SSD with 60 % treatments.