Abstract: In the oil custody transfer metering process of Sino-Kazakhstan Crude Oil Pipeline, the oil custody transfer metering results are different due to the use of the Russian ГOCT Standard Crude Oil Metering Method and the Chinese National Crude Oil Metering Method, In this paper, the static metering and dynamic metering calculation formulas of two metering methods are introduced, The difference of two methods is compared:that is, ГOCT Standard Metering measures the net weight of crude oil in vacuum, Chinese National Standard measures that in the airs ГOCT Standard Metering subtracts the water, chloride and impurities in crude oil when calculating oil amount, and Chinese National Standard subtracts the water in crude oil only when calculating the oil amount, The calculated oil amount by ГOCT Standard Metering will agree with the oil amount by Chinese National Standard if the latter is multiplied by the air floatation correction coefficient 0.9987 for modification.