First, wash the chicken gizzard-membrane and dry it. As we all know, chickens need to eat some fine gravel to help digestion when they are alive, so their stomachs are usually unclean. In addition, the stomach wall is usually wrinkled, so this step must be patient and clean. After the chicken gizzard-membrane is dried, it needs to be exposed again. The function of exposure is ultraviolet sterilization, and the other is full drying to prepare for later grinding. Be sure to bask in it until it is crisp, and it will break with your hands. After drying, grind the dried Endothelium Corneum Gigeriae Galli into powder with a pulverizer and pass through a 120 mesh sieve to ensure the fineness of the powder. If the powder is not fine, it is not easy to digest and the digestion effect is not good. Generally speaking, it is not easy for individuals to make such fine powder at home. You can go to the farmer's market and spend some money to find a special grinder to grind the powder.