Abstarct: The most important problem in agriculture in arid and semi-arid areas is salinity. Salinity interferes with nutrition of plants by affecting the availability of nutrition elements. Also in terms of salinity stress, ionic efficiency or impairment is caused by competition of nutrition elements like potassium, calcium and nitrate with toxic ions of sodium and chlorine. By improving nutrient uptake, mycorrhiza symbiosis with plant roots can cause a positive reaction in plants especially in salinity stress situation. In order to evaluate the effect of mycorrhiza and potassium fertilizer in saline conditions, a pot experiment was conducted on pomegranate tree in a greenhouse in Agricultural Research Center in Shahrood. This research was Factorial in a completely randomized design with three replications. Experiments factors included 2 levels of potassium fertilizers (Non-use and use), 2 levels of mycorrhiza (Non-inoculated and inoculated), 3 levels of salinity (1, 4 and 8 dS m) of sodium chloride. The results showed that inoculation with mycorrhizal causes increase in root dry-weight, the ratio of potassium to sodium in aerial organs and roots and mycorrhizal colonization. Most of measured traits in plants were affected by salinity. It was in a way that Salinity decreased aerial organs and root dry-weight, height, leaf area, root potassium and mycorrhizal colonization. It also significantly increased the amount of sodium chloride in roots and aerial organs and chloride of aerial organs. The amounts of potassium increased under the influence of potassium fertilizers in the plant aerial organs and roots, leaf area and chlorophyll index, height and aerial organs and root dry weight. Sodium and calcium amounts decreased in aerial organs. There was a significant interaction between potassium and salt on the plant and it increased the height and root dry weight In terms of using potassium. Interaction of mycorrhiza and potassium reduces the amount of sodium in aerial organs so that the lowest amount of sodium in terms of using fertilizer and inoculation was with mycorrhizal. Interaction of potassium and mycorrhiza wasn’t so effective on sodium.