Polylactic acid (PLA) is a new biodegradable and renewable biodegradable material,which is made from starch proposed by renewable plant resources (such as maizeand cassava).Starch raw materials obtained glucose through saccharification, andthen fermentation of glucose and certain strains to produce high purity lactic acid,and then through chemical synthesis method to synthesize polylactic acid of a certain molecular weight.t has good biodegradability and can be completelydegraded by microorganisms in the nature under specific conditions after use,resulting in carbon dioxide and water, which dces not pollute the environment. Thisis very beneficial to the protection of the environment and is recognized as anenvironmentally friendly material.