Nanshan district is surrounded by the sea on three sides and the mountain on one side, belonging to the coastal area with low mountains and hills. There are Da Nanshan, Tanglang Mountain, Yang Taishan and Xili Reservoir, Changlingpi Reservoir and Tiegang Reservoir in the area. With abundant sunshine, abundant rainfall and warm and humid climate, it belongs to a typical tropical maritime climate in South Asia. The four seasons are characterized by long summer and short winter, with an average of 185 days in summer and 25 days in winter. Average sunshine hours for many years 1924.2 hours. The annual average temperature is 22.7℃, the daily minimum temperature is ≤5℃, the annual average days are 2.9 days, the daily maximum temperature is ≥35℃, and the annual average is 3.3 days. Average annual precipitation 1976.8 mm, average annual precipitation days 143 days. Nanshan District has a good natural environment suitable for the growth, development and cultivation of litchi, so Nanshan litchi with local characteristics has been bred.