Guangyuan City belongs to subtropical humid monsoon climate; it is located in the southern foot of Qinling Mountains, which is a transition zone between North and south. It has the characteristics of humid climate in the South and the characteristics of high sky, light clouds and bright sunshine in the north. In the south, it is cold in winter and hot in summer; in the north, it is cold in winter and cool in summer, and the temperature drops rapidly in autumn. The annual average temperature is 16.1 ℃, the temperature in July is 26.1 ℃, and the temperature in January is 4.9 ℃. The annual rainfall is 800-1000 mm, the sunshine duration is 1300-1400 hours, and the frost free period is 220-260 days. It has four distinct seasons and is suitable for biological reproduction. However, natural disasters, especially drought, are frequent.