Radix Polygoni Multiflori Preparata alone has little effect on correcting yin deficiency of liver and kidney. Generally, it is used in combination with drugs and herbs that nourish liver yin, such as Lycium barbarum, black sesame or mulberry, and is also often used as decoction. Modern graduate students' long-term use of Radix Polygoni Multiflori Preparata is harmful to the liver and much smaller, but it is still not recommended to use it in large quantities for a long time.