"Arbor Day" is a festival stipulated by some national laws to publicize forest benefits and mobilize the masses to participate in voluntary afforestation. According to the length of time, it can be divided into Arbor Day, Tree Planting Week or Tree Planting Month, collectively known as Arbor Day. Through this kind of activity, people's feelings of loving forest afforestation are aroused, people's understanding of forest functions is improved, the greening of the country is promoted, and the purposes of loving forest protection, expanding forest resources and improving ecological environment are achieved. A festival to mobilize the whole people to plant trees. In China, Tomb-Sweeping Day was designated as Arbor Day by the government in March of 19 15, that is, 12. Later, on1April 7, 928, the government of the Republic of China issued a tree planting order: the Qingming Arbor Day in the old calendar should be changed to plant trees a few years after the death of the Prime Minister. "The government of the Republic of China issued this order because Mr. Sun loved' tree art animal husbandry' very much since he was a child. When studying abroad, he often used holidays to go back to his hometown to plant mulberry trees. 1On February 23rd, 979, the 6th meeting of the 5th the National People's Congress Standing Committee (NPCSC) decided to keep March 12 as China Arbor Day to encourage people of all ethnic groups to plant trees, green the motherland, improve the environment and benefit future generations.