Abstarct: Population growth, improved nutrition, and increased consumption of oilseed meal in livestock and poultry feed have increased the need for oilseed production worldwide; Therefore, the development of cultivation of oil products for self-sufficiency is very serious, which requires coherent and long-term planning with the aim of achieving self-sufficiency. Oilseed crops can grow in a wide range of soil, water and climatic conditions, among which rapeseed with the scientific name (Brassica napus) is one of the most important oilseeds that provides more than 80% of Iran's edible oil and in A large area of the country is cultivated. Salicylic acid is one of the phenolic compounds that play a regulatory role in the biological and biochemical processes of plants. In order to investigate the effect of salicylic acid on canola growth reactions, a factorial experiment was conducted in a randomized complete block design with 4 replications. Experimental factors: The first factor consisted of three canola cultivars (Niloofar, Nima and Nafis) and the second factor included three levels of salicylic acid (non-consumption, application of 250 μM and application of 500 μM) as a foliar application in two stages (autumn and late winter). The results showed that although 1000-seed weight and grain yield in Nafis cultivar were higher than other treatments in non-application of salicylic acid, but in the other two cultivars the application of salicylic acid had a significant effect. Plant height in Niloufar cultivar and foliar application with a concentration of 500 μM was higher than other treatments and stem diameter was the highest with no salicylic acid consumption. Interaction of salicylic acid and rapeseed cultivars on stem fresh and dry weight, greenness index, number of pods per plant, chlorophyll a, chlorophyll b, total chlorophyll, chlorophyll a / b, carotenoids, grain yield, harvest index, grain protein percentage and grain oil percentage He was hanged. Concentration of 500 μM salicylic acid increased the percentage of nitrogen and grain protein, percentage of oil, chlorophyll and carotenoids, , dry weight of leaves, leaf area index, plant height, number of pods and number of seeds. Stem dry weight and pod weight also increased under the concentration of 250 μM salicylic acid. Also, among different rapeseed cultivars, Niloufar cultivar caused the highest amount of traits. From the results of this study, it can be inferred that the effect of salicylic acid in different canola cultivars is different and by affecting the physiological processes of the plant, it increases the yield of canola.