At the national level. Cloud teaching is a social practice public welfare activity with the Youth Development Department of the Central Committee of the Communist Youth League as the guiding unit, China Guanghua Science and Technology Foundation as the organizer and Yiyou Youth as the organizer. The purpose of this activity is to call on college students to participate in social practice and volunteer service during the festival, and to pay attention to the young people in 160 national rural revitalization key help counties and "childlike innocence harbor" project counties in the form of "one-on-one" through the combination of online and offline, to convey red culture and tell excellent red stories.