The ratio of moxa floss is a standard used to measure the quality of moxa when making moxa sticks and rolls, that is, the ratio of a certain weight of fresh moxa leaves to the weight of moxa floss produced at the end of the production. 1. Ai velvet is a soft, fine, cotton like material obtained by repeated mortar and pestle, pounding, crushing, sifting out impurities and dusting of Ai leaves, as early as in the “Compendium of Materia Medica”, there is a record of how to make Ai velvet and the ratio of making it. And the ratio of moxa velvet is used to measure the quality of moxa velvet, one of the agreed parameters, the common explanation is that the production of 1 kilogram of moxa velvet using n kilograms of raw materials of moxa leaves, the ratio of moxa velvet is n:1. 2. The production process of moxa velvet is that moxa leaves are crushed and filtered to obtain moxa velvet. The more times it is crushed and filtered, the less moxa velvet it gets, the higher its purity, and the larger the ratio of moxa velvet. When making moxa sticks, the higher the proportion of moxa velvet, the better the quality. Generally, the ancient method of making moxa sticks can reach the ratio of 8:1, and the modern technology can reach 10:1. Therefore, when purchasing moxa sticks, ordinary people can choose moxa in the range of 5:1 to 10:1. It is recommended that patients who need to buy moxa should go to regular hospitals to buy moxa, so as not to buy bad quality moxa to affect the therapeutic effect. The operation of moxa is recommended to be carried out under the guidance of professional physicians.