This standard specifies the definition, technical requirements, test methods, inspection rules and marking, labeling, packaging, transportation and storage requirements of polyester low elastic yarn. This standard applies to polyester low-elastic network yarns with a bus density of 55-360drex, a monofilament linear density of 1.0-5.6dtex, a circular cross-section, natural color, and semi-dull civilian use. Other types of polyester low elastic yarn can be used as reference.