There is a large area of Cotinus coggygria in Zhuangziling, Handan, which turns red every year from the middle and late period of 10 to the middle period of 1 1. In autumn, when the temperature drops, the leaves will gradually turn red. The time to turn red is not fixed. Due to the influence of climate and environment in that year, if the temperature drops rapidly in that year, the leaves will turn red earlier. After turning red, the red leaves all over the mountains are as red as blood, unpredictable, mysterious and profound, and very beautiful.