The results revealed that application of stigmasterol to salt-stressed flax plants causing significantly increased in growth parameters, membrane stability index, photosynthetic pigment and carbohydrate contents compared with salt-stressed plants untreated with stigmasterol. The level of antioxidant system components (catalase, ascorbic acid peroxidase) and reduced glutathione with increased in response to stigmasterol treatment. Enhanced antioxidant activities helped to decrease oxidative damage from salt and