Cooper paper and black millet are the same Chinese medicine. Chinese medicine scientific name Psoralea corylifolia alias: Hu Jiuzi, osteoclast paper, osteoclast paper, Buguyan, Heiguzi, Hu Guzi, Ji Guzi and Heiguzi are the fruits of the leguminous plant Psoralea corylifolia. When the fruit is ripe in autumn, it should be harvested while it is ripe, cut into ears, dried in the sun, seeded and purified, cultivated or wild. Distributed in Shanxi, Shaanxi, Anhui, Zhejiang, Jiangxi, Henan, Hubei, Guangdong, Sichuan, Guizhou and Yunnan. Processing: Psoralea corylifolia: remove impurities, wash and dry. Sexual taste: spicy; Bitter; Sexual temperature and meridian tropism: kidney; Pericardium; Spleen; Stomach; Indications of lung meridian function: tonifying kidney and strengthening yang; Receiving qi to relieve asthma; Warming spleen and stopping diarrhea.