This standard specifies the terms and definitions, product identification, basic requirements, technical requirements, test methods, inspection rules, marking, packaging, transportation, storage and quality commitment of cationic dyeable modified polyester low elasticity yarn. This standard is applicable to cationic dyeable modified polyester with a total linear density of 30.0dtex ~ 700.0dtex, a single filament linear density of 0.3dtex ~ 7.0dtex, a circular cross-section, and stretched and deformed by cationic dyeable modified polyester pre-oriented yarns. Low stretch yarn. Other types of modified polyester low elasticity yarns that can be dyed with cationic dyes can be used as a reference.