This is a national standard concerning bio-based materials, with its core purpose being to provide unified specifications for films primarily made from polylactic acid resin and produced via the biaxial stretching method using flat film technology. The standard specifically outlines the classification methods, key technical requirements, inspection rules, as well as related aspects such as labeling, packaging, transportation, and storage for such products. To scientifically evaluate the performance of the films, the testing methods described in the standard typically involve the use of specialized instruments, such as electronic tensile testing machines for measuring mechanical strength, haze meters and light transmittance testers for assessing optical properties, and gas permeability testers for examining barrier properties.