In order to achieve long-term ecological improvement and sustainable development of saline-alkali soil，the effects of biochar and functional microbes on the nutrient contents of coastal saline soil and the growth of halophyte mallow were studied under salt-alkali stress. We conducted a greenhouse experiment(8 treatments)to study the effects of biochar(BC)，arbuscular mycorrhiza fungi(AMF)and phosphate solubilizing fungi( Apophysomyces sp. SM-1)on the coastal saline soil nutrient indicators and the growth of the halophyte seashore mallow under salt-alkali stress conditions. The results of the pot experiment showed that both functional microbes and biochar significantly affected the progress of coastal saline soilimprovement and the growth of seashore mallow. In terms of soilpH，both functional microbes and biochar promoted coastalmallow to reduce the pH value of coastal saline soil. The combination of AMF and biochar had the lowest pHvalue，while thesoil pH of BC treatment was relatively high. In terms of soil watercontent，except for the combined application of AMF，SM -1andbiochar，other treatments increased the water content of coastal saline soil in different degrees，and the effect of soil water content in the treatment of SM-1 was moresignificant，which was 90.7% higher than that of the control group. In termsof soil nutrientcontent，biochar significantly increased soil organiccarbon，available nitrogen and available phosphorus. AMF and SM-1 had a certain effect on the promotion of soil organiccarbon，available nitrogen and available phosphorus when inoculated alone. The effect of AMF and SM-1 mixed inoculation on soil organic carbon and available nitrogen content wascomparable to those of biocharalone，and the combined effect of AMF and SM -1 on soil available phosphorus was better thanthat ofbiochar，which was 17.99% higher than the control. The combination ofAMF，SM -1 and BC had the best promotionon soil organiccarbon，available nitrogen and availablephosphorus，which increased by58.33%，4.83% and23.09%，respectively. At the sametime，AMF，SM -1 and biochar significantly increased the plantheight，main rootlength，main root thickness and dry weight of the plant. AMF and SM-1 had better growth promoting effect on seashore mallow than biochar under salt-alkalistress，while biochar contributed to the accumulation of dry matter in plants.Therefore，under theconditions of houseplant experiment，AMF，phosphate -dissolving fungi and biochar could affect the physical and chemical properties of coastal saline soil and the biomass of seashore mallow. The effect of biochar on the improvement of coastal saline soil fertility was better. AMF and phosphate-dissolving fungi had better growth-promoting effects on seashore mallowplants， and the combined application of the three factors had positively promotion of the improvement of coastal saline soil and the growth of salt-tolerant plants.