Vanadium Redox Flow Batteries (VRB) is one of the most rapidly developed accumulation energy in recent years. Regard as the most important component

the separate membrane in VRB is directly related to the efficiency of transformation of energy storage and service life. In this paper

we give a brief introduction of the present situation of the VRB separate membrane. Nafion membrane as the most widely used membrane is discussed on the conduction mechanism

the exchange mechanism and the modification technologies

such as surface coating

crosslinking

surface recombination and so on. Then the advantages and disadvantages of various modification methods were analyzed by compared with each other. In addition

recent progresses about the non perfluorinated heat-resistant proton exchange membrane of sulfonated special engineering plastic membrane and the functionalization of polyolefin membrane are made a comprehensive summary. At last

we give the development trend of VRB in the future.