This document stipulates the classification and coding, technical requirements, test methods, inspection rules, batching and sampling, marking and accompanying documents, packaging, transportation and storage of biomass particles for clean heating. This document refers to pellet fuel produced from wood, bamboo, reed, fruit shells, chaff, etc., which is suitable for heating or heating of clean stoves, small biomass boilers and other small heating equipment. Pellets fuel made from straw and other herbs can be used as a reference.