Wu Mei is the dry, nearly mature fruit of Plum, family Rosaceae. Mainly produced in Sichuan, Zhejiang, Fujian and other places. Plum herb properties for spherical or oblate spherical, 1.5-3cm in diameter. surface black or brownish black, wrinkled uneven, the base of the round fruit peduncle scars. The fruit kernel is hard, ellipsoid, brownish yellow, with pits on the surface. Seeds compressed ovoid, light yellow. Gas slightly, taste very sour. The flavor of umeboshi is sour, astringent, flat, and belongs to the liver, spleen, lung and large intestine meridians. There are astringent antidiarrheal, astringent lung cough, thirst and other effects. Can be used to treat the spleen and kidney Yang deficiency caused by prolonged diarrhea, often with nutmeg, ginseng, chebulin and so on. Can be used to treat the spleen and kidney Yang deficiency caused by prolonged diarrhea, often with nutmeg, ginseng, chebula and so on.