Due to the extremely narrow distribution area of Chimonanthus praecox in China, serious deforestation, deterioration of ecological environment and even smaller natural distribution area, Chimonanthus praecox is listed as a rare and endangered plant under national second-class protection in order to strengthen protection. Contrary to the habit of wintersweet blooming in the middle of winter and the twelfth month, it didn't reveal its fragrance until early summer, so it is even more precious. Many botanical gardens and flower lovers, such as Japan in the east, Britain and France in Europe, the United States and Canada in America, regard the introduced Chimonanthus chinensis from China as treasures.