The pharmaceutical edible method of Polygonum multiflorum Thunb. is as follows: black beans are cooked and filtered, yellow wine is added into black bean juice, then Polygonum multiflorum Thunb slices are mixed, steamed in a cage and dried in the sun, and can be taken after nine times of steaming and nine times of drying. You can also steam Polygonum multiflorum with yellow wine alone, and repeat this for nine times. There is also a kind of nine-steaming nine-drying nine-dew, the method is the same as above, that is, steaming in the morning and taking it out during the day to make the dew wet at the night of the sun race, and so on for nine days, which is nine-steaming nine-drying nine-dew. As for how long it takes to steam, it is about 1 hour. The medicine requires not to touch iron as much as possible.