Arbuscular Mycorrhizal Fungi(AM fungi)is one kind of fungi that exists widely in the rhizosphere of terrestrial plants，and form mutualistic symbiont with host plants，which plays the important ecological roles and functions in rhizosphere environment.From the aspects of arbuscular mycorrhiza improving host plant abiotic stresses(water，temperature，salinity，heavy metals，etc.)resistance，biotic stresses(plant diseases，etc.)resistance and changing the the host rhizosphere microecology，etc.，the ecdogical roles，interaction mechanisms and research hotspots of AM fungi were reviewed.