1. Citrus is produced in Gansu, southwestern Shaanxi, southwestern Jiangxi, Sichuan, Hubei, Hunan, Jiangsu, Guizhou, Guangxi, Guangdong and mountainous areas in northeastern Yunnan. They are wild and cultivated.

2. Oranges are mainly divided into sweet orange, navel orange, blood orange, sugar orange and red orange. In China, young fruits and fallen fruits can be dried and used as medicine. Storage and transportation resistance.

3. The maturity difference is large, which can prolong the supply period of fresh fruit and processing raw materials. Citrus varieties can be divided into early, middle and late maturity according to fruit maturity.