Abstract: The height of rail tanker, model of strapping table of tanker, and special tanker will influence the accuracy of metering results in the oil metering of rail tanker.By means of integrating the height of rail tankers and determining the model of strapping table of tanker as well as the height of special tanker, the oil volume of tankers has been calculated with a kind of tanker meter.The comparison between the calculation data and that of rail weighter has been carried out.The result shows that the custody transfer metering method is accurate, reliable, and suitable for rail tanker.