The starch in the plant is extracted and fermented to produce lactic acid, and then made into PLA polylactic acid fiber through advanced polymerization and spinning technology. Products made of this material are healthy and safe, non-toxic, tasteless, and harmless to the human body. In addition, if the product is discarded under composting conditions, it can be completely decomposed by microorganisms, eventually generating carbon dioxide and water, and returning to nature. Without causing any pollution to the environment, PLA is recognized as a "green material" for low-carbon, environmentally friendly and sustainable development in the 21st cent