Cai Lun's ancient papermaking technique is to use hemp heads, rags, fish nets and tree bark to make plant fiber paper. It originated in the first year of Yuanxing in the Eastern Han Dynasty (105). Leiyang is the hometown of Cai Lun. On the basis of Cai Lun's personal teaching of papermaking, the ancient papermaking technique of Cai Lun has been completely and systematically inherited and developed. For a long period of history, it has become an industry famous in Leiyang and even in the whole country. During the Tang and Song Dynasties, Leiyang was the main paper production area in Hunan and Xiang, and its products included wrapping paper, Xiang thin paper, leather paper, money paper, five-color paper, etc. In the Ming Dynasty, it formed famous and high-quality products with local characteristics. Leiyang paper from Hengzhou Prefecture was included in the Wanli "Huguang Tongzhi Fangchan". In the Qing Dynasty, Cai Lun's ancient papermaking entered its heyday in Leiyang, with an annual sales volume of 20,000 dan (90 sheets of paper for one dan, 360 dan for one dan). In addition to meeting local demand, a large amount of paper is shipped to Guangdong and Hubei, and sold to all parts of the country through ports such as Hengzhou, Xiangtan, Changsha, Hankou, and Chenzhou. During the Republic of China period, the invasion of the Japanese invaders and the outbreak of the full-scale civil war after the victory of the Anti-Japanese War greatly affected the ancient papermaking industry in Leiyang, and workshops stopped production one after another. After the founding of New China, the ancient papermaking industry was once restored and developed, but with the construction of modern paper mills and the introduction of machine production in some handicraft workshops, the ancient papermaking industry was greatly impacted and was obviously at a disadvantage in the market competition and gradually declined. For thousands of years, Cai Lun's ancient papermaking has been fully inherited and developed in Leiyang. On the one hand, Leiyang is the hometown of Cai Lun, and the papermaking skills are derived from Cai Lun's personal teaching. To this day, Cai Lun must be worshipped on the first and fifteenth day of the lunar month, when the slot is set (that is, preparing for papermaking within the year), and when the slot is scattered (papermaking ends within the year). On the other hand, it is inseparable from Leiyang's superior geographical environment and natural conditions. Leiyang is located in the transition zone from the southern edge of the Hengyang Basin to the Wuling Mountains in the southeast of Hunan Province, with a longitude of 1123811313 east and a latitude of 26082643 north. It has a subtropical rheological climate. The abundant rainfall, mild climate and rich vegetation provide abundant water sources, sufficient raw materials and suitable climatic conditions for the development of the ancient papermaking industry. Because of this, Cai Lun's ancient papermaking workshops are widely distributed in Leiyang, reaching more than 10 towns and villages, with about 500. Among them, Huangshi, Dahetan, Shangbao, Taozhou, Yansha, Sandu and other towns rich in nanmu are the main distribution areas. Such a large group of ancient papermaking workshops, with its diverse products in printing, packaging, painting, religion, sacrifice and many other fields, has made great contributions to the development of Leiyang, Huxiang region and even Chinese civilization and social and economic development. And its papermaking skills, from the selection of raw materials to the setting of process flow, are based on its own products and other conditions, which is conducive to the development of Cai Lun's papermaking on the basis of inheritance. This spirit of daring to explore and be the first is the best inheritance of Cai Lun and the essence of Hunan culture. The ancient papermaking technique of Cai Lun in Leiyang has been passed down from generation to generation for thousands of years, relying on the master-apprentice relationship, the master's words and deeds, and the apprentice's comprehension and practice. Many key skills have no specific physical and chemical indicators and are mastered entirely by experience. It is very obvious that the ancient papermaking technique of Cai Lun in Leiyang is indeed a typical intangible cultural heritage and should be properly protected, so that the ancient papermaking technique of Cai Lun, which has made great contributions to the development of human society and made the Chinese proud, can be completely and systematically preserved in Leiyang, Cai Lun's hometown, and it will shine with new brilliance.