The morphology of inclusion that was increased with adding aluminum scrap in aluminum melt was observed by OM （optical microscope）, and the Tafel curves and the linear polarization resistance were measured to obtain the corrosion potential and corrosion current. The results indicate that, with the increase of aluminum scrap, the Tafel curves moves towards right, and the linear polarization resistance is decreased, and the corrosion potential moves towards negative as well as increasing in corrosion current. The regression model for describing relationship between inclusion content and electrochemical parameters was established based on the linear change of electrochemical properties with inclusion variation, meanwhile, the new way on electrochemical parameters characterizing inclusion in aluminum melt was proposed.