Abstract: Natural gas on-line analytical systems are installed on most A-grade (classified according to GB/T 18603-2014) gas station of long distance transportation pipeline. They're used to measure composition of natural gas, which is the basic data to calculate physical properties, such as calorific value and compression factor. The physical properties are very important for gas trade measurement. Hence, the precision of analytical systems measurement result is important too. Application of natural gas online analysis system performance evaluation standard for natural gas metering station is introduced in this paper. Determination method of composition for reference material is illustrated. Judgment method and example for the qualification of gas chromatograph's effectiveness, repeatability, resolution and consistency are given. Viewing from the standard application result, some analytical system's differences between test result and reference gas have exceed the limit of the standard requirement. The difference may introduce 0.05% error to physical property and gas volume. This amount of error can be ignored, since natural gas trade measurement is based on volume now. The precision of analytical system should be improved when energy measurement is adopted in the future. In order to keep the instrument running properly, performance evaluation should be carried out at least once every two years.