The experiment was carried out at the Farm Experimental of Sakha Agricultural Research Station (El-Hamrawy), Agricultural Research Center (ARC), Egypt  through  2015/2016 and 2016/2017 seasons to investigate response  of three flax cultivars  to  nitrogen and  phosphorus fertilizers levels on yields and its components as well as technological characters  under saline soil conditions. The experiment was done in a split-plot design with three replications. Where, the main-plots were allocated to three flax cultivars i.e. Sakha 3 (fiber flax cultivar), Giza 11 (dual purpose flax cultivar) and Sakha 5 (oil flax cultivar). The sub-plots were allocated to four combination treatments of nitrogen and phosphorus fertilizers i.e. 45 kg N + 15.5 kg P₂O₅/fed, 45 kg N + 22.5 kg P₂O₅/fed, 55 kg N + 15.5 kg P₂O₅/fed and 55 kg N + 22.5 kg P₂O₅/fed. The results were obtained could be summarized as follows:* Sakha 3 gave the best results  other  to  flax cultivars under studied  and produced the maximum valuesof length of technical , fiber yield per plant and per feddan, fiber length, total fiber % and fiber fineness in both seasons. Meanwhile, Giza 11 cultivar significantly superior other studied cultivars and resulted in the maximum values of diameter of stem , straw yield per plant and per feddan, length of fruiting zone, No. of capsules/plant, 1000-seed weight, No. of seeds/plant, seed yield per plant and per feddan in both seasons. However, Sakha 5 cultivar produced the maximum values of seed oil content. *Maximum numbers of all characters studied were showed from fertilizing flax plants with 55 kg N + 22.5 kg P₂O₅/fed, except fiber fineness in both seasons. It can be mentioned that mineral fertilizing Giza 11 cultivar with 55 kg N + 22.5 kg P₂O₅/fed in order to maximizing seed yield and its components and mineral fertilizing Sakha 3 cultivar with 55 kg N + 22.5 kg P₂O₅/fed to maximizing straw and fiber yields under saline soil conditions in Kafrelshiekh governorate, Egypt.