DROUGHT impacts on flax growth are aimed to be alleviated by soaking seeds in stigmasterol then sowing in pots. On the 24^th day after sowing, water regime was applied and samples were harvested up to the 56^th day after sowing for measuring growth parameters, free radicals, antioxidants and Ru-1,5-P carboxylase/oxygenase (Rubisco). At seed maturity, yield analysis measurements (capsules, seeds, oil yield and fatty acid composition) were performed. Drought provoked significant decreases in growth parameters, ascorbic acid and glutathione but elevated lipid peroxidation and H₂O₂ concurrently with significant inhibition in the activities of catalase, guiacol peroxidase, ascorbate peroxidase, glutathione reductase, glutathione peroxidase and Rubisco. Yield analysis demonstrated declines in capsule and seed numbers, the oil as well as both contents and composition of fatty acids. Nevertheless, stigmasterol diminished drought impacts on growth parameters, antioxidants and Rubisco and rendered the contents of lipid peroxides and H2O2 comparable to control. In the meantime, oil yield and fatty acid composition were improved in synchronization with the efficiency of antioxidants and reactive oxygen species (ROS) homeostasis. These findings conclude that stigmasterol alleviated these drastic impacts and improved oil yield and fatty acid composition via modulating efficient antioxidant capacity and ROS homeostasis.