The perfluorinated ion exchange membrane (PFIEM)was the crucial materials in the proton exchange membrane fuel cell (PEMFC)and chlor-alkali industry,which widely used in the fuel cell,chlor-alkali indus-try,vanadium battery,etc.As one of the key components,the structure and properties of the PFIEM deter-mine the performance of the battery or cell.Annealing was a kind of traditional technological process,which was simple and convenient,being widely used in the research of the PFIEM performance.In this review,accord-ing to different properties of the ionic membrane,we mainly outline the annealing effect of perfluorinated ion exchange membranes on the proton conductivity,methanol permeability,mechanical properties,permselectivi-ty,etc.,respectively.The characteristics of the research at present and developing directionare summarized.