Abstract: The morphologic characteristics of arbuscular mycorrhiza (VAM),its nutrient function and its relation with other microorganisms such as nodule bacteria are discussed.Environmental factors,cultivated managements and rotation systems affecting VAM are also analyzed.The authors advance that VAM potential resource should be fully utilized through strengthing basic reseach,inoculating exernal VAM fungus resource and making use of original VAM fungus resource for sustainable increase of crop output.