Intercropping plays an important role in the formation of red soil aggregates and the increase of soil phosphorusavailability.A field experiment was conducted to explore the effects of maize and soybean intercropping on soil aggregates andtheir available phosphorus under different Prates(P0 0 kg/hm²，P60 60 kg/hm²，P90 90 kg/hm² and P120 120 kg/hm²)toprovide scientific basis for improving the aggregate structure of red soil and the utilization of phosphorusfertilizer.The results showed that both phosphorus fertilizer application and intercropping contributed to the formation of water stable aggregatesand the increase of mean mass diameter soil.Maize and soybean intercropping significantly increased the proportion ofwater stable aggregates and the mean mass diameter of maize soil by 10.5% and 10.8% in comparison to monocroppedmaize，respectively，and the proportion of soil water -stable aggregates and the mean mass diameter of soils reached their maximumat the P120 rate.Intercropping of maize and soybean increased the content of soil >0.25 mm aggregates，especially thesoil >2 mm aggregates content increased by23.2%，while decreased the content of soil <0.053 mm aggregates by10.2%.In addition，the contents of available phosphorus in 1～2 and 0.25～1 mm aggregates of intercropped maize were significantlyincreased by 74.9% and 72.8% comparison to monocroppedmaize，respectively，but there was no significant effect onothers. Pearson correlation analysis and multiple linear stepwise regression analysis showed that there was a significantly or extremely significantly positive correlation between available phosphorus content in topsoil and available phosphorus in different sizes ofsoilaggregates，where the available phosphorus content in 0.25～ 1 and <0.053 mm aggregates played a significant impact onthe content of available phosphorus intopsoil.It can be concluded that maize intercropped with soybean has the potential to improve soil aggregate structure and soil available phosphorus content.