Research conclusions ： As an important evaluation index of the durability of high property concrete for passenger dedicated line，electric flux is influenced by many factors ； The electric flux of concrete increases gradually with increase of water - glue ratio. The air content has less influence on the electric flux of concrete and the electric flux of concrete still meets the requirement of the concrete durability when it is up to 4%. The mud content of sand for concrete should be less than 4%. The 40% fly ash blend ratio is not only the return point of the pressure resistance of concrete, but also the limitation point of the concrete durability. The ignition loss of fly ash has big influence on the early electric flux and 28d electric flux of concrete, but less influence on 58d electric flux. To the electric flux of concrete, the external agent should have the max. limitation ratio.