Abstract: Taking canola ‘Huayouza 62’ as the test material, a pot experiment was conducted, the saline-alkali gradient was low, morderate and high, then the organic liquid fertilizer for facilities was 2,4 mL·kg^-1 and 6 mL·kg^-1 under each saline-alkali gradient, respectively.The effects of different amounts of organic liquid fertilizer on the physiological and photosynthetic characteristics of canola at seedling stage under saline-alkali mixed stress were investigated, in order to provide reference for the planting technology of canola in saline-alkali land of Xinjiang.The results showed that the soluble sugar and soluble protein contents, net photosynthetic rate, transpiration rate, intercellular CO₂ concentration and stomatal conductance of canola seedlings were increased after the application of organic liquid fertilizer under different saline-alkali stress, while the activities of peroxidase, catalase and superoxide dismutase increased significantly（P＜0.05）.When the concentration of organic liquid fertilizer was 4 mL·kg^-1 and 6 mL·kg^-1,the physiological and photosynthetic parameters of canola seedlings under moderate saline-alkali stress were better than those under mildium and severe saline-alkali stress.The effect of applying organic fertilizer in the early stage was better than that in the late stage.In conclusion, the application of 4 mL·kg^-1 of organic liquid fertiliser under moderate saline-alkali stress significantly improved the physiological characteristics and photosynthetic parameters of oilseed canola seedlings and adapted them to the saline-alkali environment, more significantly in the early seedling stage than in the late seedling stage.