Two points need to be noted when using Radix Polygoni, one is to distinguish between raw Radix Polygoni and Radix Polygoni according to their efficacy; the other is to avoid using iron in the decoction process. The Chinese herbal medicine classification belongs to the blood tonic, due to its different ways of preparation, divided into the system of shou wu and raw shou wu: 1, the system of shou wu taste sweet, astringent, slightly warm, into the liver meridian, kidney meridian. It is often used to treat palpitations, insomnia, dizziness and dizziness caused by blood deficiency, as well as dizziness, tinnitus and premature graying of the hair due to deficiency of kidney essence and liver blood. 2, Raw Radix et Rhizoma is sweet, bitter and mild in nature, entering the heart meridian and large intestine meridian. It can be used to treat scrofula, carbuncle and gangrene, dry bowel and constipation, deficiency and prolonged malaria.