Multifocal electroretinogram(mf-ERG)is a common type of electroretinogram. It can objectively, accurately and quantitatively detect the function of each tiny part of the retina, so it is widely used in clinical, especially in retinal diseases. It not only plays an important role in the diagnosis and efficacy evaluation of retinal diseases, but also has an important value in the follow-up and prevention of diseases, even the scope of its application can be extended to basic research. Therefore, this paper reviews the application of multifocal electroretinogram in retinal diseases.