Longnan belongs to the East Asian monsoon climate zone. Due to the special geographical location and the influence of mountains, the climate in this area is complex and diverse, with unique distribution, and the horizontal zoning and vertical zoning are very obvious. The annual average temperature is 5℃- 15℃, sunshine hours 1700-2000 hours, active accumulated temperature is 2600-4600℃, annual precipitation is 450- 1000 mm, and frost-free period 166-285 days. Wudu, south of Wenxian County and southeast valley of Kangxian County are below 1 1,000m above sea level, with annual average temperature above 14℃, active accumulated temperature above 4,500℃, annual precipitation above 450- 1 000mm, and local annual precipitation above 1 300mm.

There is basically no ice age in winter in Kangxian county, and there is plenty of water and heat. Especially in the ravine, the conditions suitable for planting lotus roots are superior. The water quality and soil quality are similar to those in Sichuan, so we can consider digging ponds to plant lotus roots. In addition, Gansu is originally an arid area, with a good market prospect, and the market potential of lotus root is still great.