Xiaoqu orange is a tropical crop, which is mainly planted in southern China. Oranges are colorful and sweet and sour. The plants of Rutaceae and Citrinae are distributed between north latitude 16 ~ 37. It is a tropical and subtropical evergreen fruit tree (except Fructus Aurantii), and there are three genera of Fructus Aurantii, Citrus and Kumquat used for economic cultivation.
The thin endothelium of oranges contains dietary fiber and pectin, which can promote defecation and lower cholesterol. Orange peel can enhance the toughness of capillaries, lower blood pressure and dilate the coronary artery of the heart.