Citrus reticulata Blanco is a subordinate plant of the Rutaceae family. Sex like warm and humid climate, cold resistance than grapefruit, lime, sweet orange slightly stronger. The citrus subfamily Rutaceae ranges from 16° N to 37° N. It is a tropical and subtropical evergreen fruit tree (except Fructus aurantii). It is used for economic cultivation in 3 genera: Fructus aurantii, Citrus and Kumquat. The citrus cultivated in China and other countries of the world is mainly citrus.