In order to explore the effect of phosphorus application rate on phosphorus uptake and yield of maize in saline soil，a 2-year field experiment was conducted to study the effects of different phosphorus levels (0，75，150，225，300 kg·hm-2) on phosphorus absorption，transport and physiological activity of maize in saline soil.Under the same phosphorus application level，the yield，biomass，phosphorus accumulation and leaf phosphorus content of each treatment in 2018 were significantly higher than those in 2017.The results showed that compared with the treatment without phosphorus application in 2018，the application of phosphate fertilizer treatment significantly increased the phosphorus accumulation in maize shoots，increased the phosphorus transport and transport rate in leaves，decreased the Na+/K+ ratio of maize leaves，meanwhile phospholipase Dζ1 activity increased by 30.7%～73.7% and pyrophosphorylase activity increased by 71.0%～235.5%，and the activity of superoxide dismutase increased by 65.4%～144.5%，significantly increased the aboveground biomass of maize in different growth periods.In 2017，the maize yield of all phosphorus fertilizer treatments increased by 42.5% ～ 85.9% compared with no phosphorus fertilizer treatment，and in 2018，the maize yield of all phosphorus fertilizer treatments increased by 30.6% ～ 79.7%，compared with no phosphorus fertilizer treatment.In order to alleviate the salt stress of soda alkaline soil in Songnen Plain and improve the biomass and yield of maize，the application rate of phosphate fertilizer in this area can be considered at 225～300 kg·hm-2.