The document stipulates the use of Gas chromatography, CG to determine the content of trace carbon monoxide, carbon dioxide and acetylene in industrial ethylene and propylene. It is applicable to the determination of carbon monoxide, carbon dioxide and acetylene content in ethylene and propylene not less than 0.5 mL/m ². Within the scope of the document, it is emphasized that users need to take appropriate safety and health measures to ensure compliance with relevant national regulations. In the normative reference document, a number of relevant documents are cited, such as the general safety rules for sampling industrial chemical products, the representation and determination of numerical revision rules and limit values, the liquid and gaseous sampling method for industrial ethylene, and the liquid sampling method for industrial propylene and butadiene. Document does not define the terms and definitions, and in the determination of carbon dioxide and carbon dioxide, describes by Gas chromatography, CG separation of each component, and by catalytic hydrogenation column of carbon monoxide, carbon dioxide into methane, and finally by Flame ionization detector, FFID (FID) detection and quantitative method using external standard method.