No.5 orange is characterized by well-proportioned fruit size, high yield, no big difference in taste between inner and outer fruits, smooth appearance and strong cold resistance. Some varieties of No.65 orange are rich in aromatic gas, and each excellent product is selected, so it is named "Si Qian No.5 orange". The fruit of this variety is round or oval, with average single fruit weight 180g and moderate size. The peel is smooth, the appearance is orange yellow and red orange after full maturity, and the oil cells are smooth and delicate. The top of the fruit is flat, with shallow imprints and shallow grooves, and the base of the fruit is flat. The peel is dense and not easy to peel off, with a thickness of 0.33 ~ 0.38 cm, 10- 12 petals. After maturity, the stele is slender, the flesh is orange-yellow, the juice cell is slender and the capsule wall is thin. The pulp is more brittle than other orange varieties, and the residue is polarized, seedless and rich in aroma.