Yizhilin brand decoction pieces of leeches are produced by using Hirudo ni pponica WHirman (Hirudo Nipponica Whirman in Chinese Pharmacopoeia) as raw material. this leech is the only blood-sucking leech among the three leeches recorded in Chinese Pharmacopoeia, and its active ingredient content (antithrombin active substance) in animals is more than 33 times that of the other two leeches (Hirudo widebody and Hirudo apiculata). Zhiqiang Biological owns the original leech seed farm in Hubei province and the leech breeding base of endangered Chinese medicinal materials in Hubei province as the leech raw material supply base, ensuring the reliable and controllable quality of the product source. Compared with the traditional methods of drying in the shade, drying by explosion and scalding with talcum, the core processing technology of Yizhilin brand leech decoction pieces is low-temperature drying and moisture-proof preservation. through rapid vacuum drying, the active ingredients are removed to the greatest extent, and Xilin bottle packaging is adopted to ensure the stable product quality during storage.