Biomass Plastics uses corn, wheat, potato and other rich starch and cellulose as raw materials, and uses biochemical technology to form biodegradable materials through refining, fermentation, synthesis and other processes. It is also a polymer (plastic) material. One of them has similar mechanical properties and physicochemical properties to ordinary plastics. Its greatest advantage is that it can be decomposed by bacteria under the ground through burial, discharging only water and carbon dioxide or methane. Polylactic acid (PLA) is the most typical and the largest yield.