Soap is an indispensable daily washing products, the history of people using soap can be traced back to Italy before the BC. From the 1980s of last century, China gradually began to use soap widely. In the Song Dynasty, there was a synthetic detergent, which was to mash the natural saponin and add a variety of medicinal petal powder to make a ball for facial washing and bathing. Some will be directly after boiling water, adding medicinal petals, soaking bath. Plant weak alkali soap (soap) is one of the skin and hair washing care products, is a kind of daily consumer goods. Some manufacturers are based on fatty acid sodium and other surfactants as the main raw materials to make soap, add quality improvers and appearance improvers, and make products after processing and molding, because these PH content is high, the skin can not be tolerated for a long time, so it can only be used to clean clothes. The plant weak alkali soap contains low PH, human skin can accept for a long time, and the various nutrients contained in the plant, as well as vitamins have the role of nourishing the skin.