Citron has the effect of draining liver and Qi, broadening the middle of the body and resolving phlegm, and can be used to treat liver and stomach stagnation, chest distension and pain, abdominal fullness, vomiting and yelping, phlegm and cough. Citron taste pungent, acid, slightly bitter, warm, to the liver, spleen, stomach, lung meridian, non-toxic, sweet and sour gas fragrance, alias is the fragrant round, for the Rutaceae plant citron or citron dried ripe fruit, mainly produced in Guangdong, Guangxi and other places, often harvested in September-October, sun semi-dry slices, shade dried into medicine, and often with Chai Hu, aromatic herb, Yu Jin and other liver and qi medicine, citron specific medicinal effects are as follows: 1. It can be used for treating liver stagnation, dysmenorrhea, dysmenorrhea, abdominal congestion, etc.; 2, broaden the middle and fast diaphragm: citron can move the qi of the spleen and stomach, can be used for treating spleen and stomach stagnation, abdominal distension and pain, yelp and acid swallowing, vomiting and vomiting, often combined with wood incense, sand and other qi regulating herbs; 3, dry dampness and resolve phlegm. Citron can move qi and regulate the middle, dry dampness and resolve phlegm, can be used to treat damp phlegm, cough phlegm and other symptoms, for phlegm and dampness, cough phlegm, chest and adverse symptoms, often combined with dampness and resolve phlegm herbs such as half summer, poria.