A pot simulation experiment was conducted to investigate the effects of different phosphorus rates on the growthand phosphorus uptake of maize and soybean intercropping system，and the shifts of each inorganic phosphorus form in therhizosphere red soil wereanalyzed.The results showed that compared to monocroppingtreatments，maize intercropped withsoybean significantly increased aboveground biomass and phosphorus uptake of crops，and had obvious yieldadvantage.Meanwhile，the grain yields of maize and soybean and maize phosphorus uptake in intercropping system under 1/2 reductionof phosphorus fertilizerapplication(P50)rate were not declined as compared to those of the corresponding monocroppingin conventional phosphorus applicationlevel(P100).Intercropping significantly reduced the content of total inorganicphosphorus in rhizosphere red soil of maize andsoybean，and the reduction of inorganic phosphorus was mainly dominated by O-P，Fe -P and Ca-P.The proportion of Fe -P，Al -P，Ca -P and O-P to total inorganic phosphorus in rhizosphere soils of maizeand soybean was mainly regulated by phosphorus rates，while these were not affected by cropping patterns with exception of Fe-P.Under the tested conditions，maize and soybean intercropping mainly stimulated the activation of O -P，Fe -P and Ca-P in soil by root interaction to improve the phosphorus uptake of maize andsoybean，and it had the potential for reducingphosphorus fertilizerinput，maintaining crop yield and phosphorus uptake.