Abstract: Arbuscular mycorrhizal fungi（AMF） is a kind of plant symbiotic fungi living in soil.Lots of studies have shown that AMF can improve the stress resistance and tolerance of plants to heavy metals.In this study,the advance of AMF and plant was introduced in order to promote the further research on the mechanism of AMF promoting plant tolerance to Cd.Outside the roots,AMF could absorb and hold Cd directly,and change plant rhizosphere microenvironment in soil,thus effect the morphology of the Cd and biological effectiveness,enhance the resistance of plants to Cd stress.Within the roots,AMF regulated specific physiological and biochemical processes in plants,such as chelation,transport,and activation of antioxidant defense systems,to reduce stress and damage to plants caused by high concentrations of Cd.In addition,AMF could also resist Cd stress by promoting plant growth.