The Perfoliate Knotweed is a polygonaceae plant, having sour taste and potassium hydrogentartrate, The Perfoliate Knotweed is widely distributed in the north and south of our country, A physical technological process for the extraction of potassium hydrogentartrate from Perioliate Knotweed is studied. The recovery is 85% and the content reaches 99.51%. That is a simple but effective method for extracting the natural...