In the process of production, processing and use, natural plant fiber will not cause much harm to human body and the earth, and the products can be naturally degraded after being discarded, which has little effect on the ecological balance of nature. Humans used natural flax fiber to make hemp thread 32,000 years ago, which was used to sew clothes and weave various handmade products. China has a long history of using natural plant fibers, especially ramie and hemp, and linen prints have been found on Neolithic earthenware. In the Book of Songs, there is a record of retting (retting ramie): "The land at the east gate can be retting" (Martin). The relationship between natural plant fiber and human life is very close. In addition to textile products necessary for daily life, ropes, packaging, weaving, paper, plastics and explosives also need natural plant fiber as raw materials.