Abstract: With the rapid development of Chinese economy, energy consumption increasing growth, gas trade measurement has been regarded highly, and the higher requirement for its accuracy and reliability have also been proposed. Considering the development of gas industry and the need of pipelines construction, China has began to building the natural gas flow measurement standard system at the end of 20th century. At present, eleven standards of methods of natural gas measurement and meter calibration have been made or revised. Based on the GB/T 18603 "Technical requirements of measuring systems for natural gas", this standard system covers gas ultrasonic flow meter, turbine flow meter and Goriolis mass flow meter, etc. The standard system can satisfy both gas long-distance transmission pipeline measurement and city gas measurement, it contains volume settlement, quality settlement and energy settlement. The standard system not only meets the needs of the rapid development of the gas industry, but also improves the internationalization level of China's natural gas measurement standards.