Abstract: At present, retinal prosthesis implant has become the most successful prosthesis technology among all kinds of visual prosthesis. The goal of the related research is providing useful vision for those patients who are left with no alternatives, especially for those who have retinitis pigmentosa or agerelated macular degeneration diseases. In accordance with the electrical stimulation position, retinal prosthesis can be divided into epiretinal and subretinal prosthesis. The former implants the microelectrode in the retina through the vitreous surgery. The latter implants  the microelectrode between the retinal nerve epithelium and retinal pigment epithelium by sclera  or vitreous pathway. In recent years, electrode array and stimulated current of the epiretinal prosthesis was improved. Scientists also developed the chips and the energy supply form of the subretinal prosthesis and expected their efforts could help blind people.