Abstract: The experiment was conducted with the mulching fabric in the orchard as the control.Three interplanting modes were set up,namely,growing grass in the orchard,planting strawberry in the orchard between rows,and cultivating seedlings in the orchard between rows.These soil samples were collected from 40 cm deep soil to determine its physical and chemical properties,and soil microbial biomass carbon,nitrogen and phosphorus ecological stoichiometric characteristics were analyzed.The results showed that soil pH value was higher under different interplanting modes compared with the control.Organic matter content,organic carbon content and total nitrogen content significantly increased in mango orchards,and soil organic matter content was positively correlated with organic carbon content and total nitrogen content.In particular,growing herbage in orchard could significantly increase organic matter content in orchards.The changes of humus composition,MBC,MBN and MBP content were similar under different interplanting modes,which were growing herbage in orchard＞interrow seedling cultivation＞interrow strawberry cultivation＞garden weeding cloth covering.The ability of soil microorganisms to hold carbon,nitrogen and phosphorus was higher than that of interrow seedling,interrow strawberry and garden cover weeding cloth,and the four indexes were correlated under different treatments,and showed a very significant correlation at 0.01 level （bilateral）.There was no significant difference in MBN/MBP ratio among different interbreeding models.The C/N ratio was the highest in orchard grass model and the lowest in the interrow strawberry mode.The C/P and N/P ratio in T₁,T₂ and T₃ were lower than those in the control group.MBC/MBP ratio was significantly correlated with C/P,and C/P ratio was significantly correlated with N/P ratio.There was no significant correlation between MBC/MBN,MBC/MBN and MBN/MBP ratio.It has a great impact on soil microbial biomass through interplanting in mango orchard,which could improve soil nutrients and enhance the ability of soil microorganisms to hold carbon,nitrogen and phosphorus.The effect of orchard grass model is more prominent especially.