This document specifies the terms and definitions, classification and identification, technical requirements, test methods, inspection rules and marking, packaging, transportation and storage requirements for protein-modified lyocell short fiber. This document is applicable to protein-modified Lyocell short fibers with a linear density between 0.90dtex and 6.70dtex produced from fiber-grade wood pulp and protein powder. Other types of protein-modified Lyocell fibers can be used as a reference.