"It's easy to get something on paper. I absolutely know that I have to do it myself." Since the summer vacation, college students from all over the country have carried out various social practice activities of "three rural trips". In Motuo, Tibet, the Tibetan rural cultural and creative products designed by the practice detachment of the Rural Revitalization workstation of Tsinghua University have achieved initial results; In Zhuanglang, Gansu Province, the social practice detachment of Nankai University opened a new model of public welfare for agriculture in the live broadcast room in the apple orchard; Cai Fuhong, a young scholar of the post-80s generation, is a researcher of Tianjin Normal University base of Tianjin Research Center for theoretical system of socialism with Chinese characteristics, mainly engaged in Marxist sociology and social governance research. Every summer vacation, we can always see the scene of college students going deep into the countryside to carry out social practice. The vast number of young students learn the truth and understand the truth through practice. They measure the land of the motherland with their feet, observe the changes of the grassroots with their eyes, listen to the voice of the people with their ears, and feel the pulse of the times with their hearts. They participate in practice and integrate into society with patriotic enthusiasm, youth ideals and professional knowledge. Actively carrying out social practice is the basis for the majority of young students to deal with the relationship between themselves and society. Marx emphasized that man is a social existence and "the sum of all social relations". Only by actively participating in the tide of social development can individuals of each era make more contributions. College students take advantage of the summer vacation to go out of the ivory tower of colleges and universities and enter the social classroom, and strive to connect with the atmosphere and observe the people's feelings in the grassroots practice. In their hard work in the fields, in their participation in rural cultural and tourism planning and homestay design, and in promoting the rural cultural transformation of "building new customs and abandoning bad habits", they have integrated their individual "small self" into the "big self" of the society, and have a deeper understanding of the general secretary's instructions: "only when they get together with the masses in society, can they have a sense of social responsibility, and can they gain insight." Actively carrying out social practice is the premise for young students to get through knowledge, understand society and serve society. "For the sake of learning, practice is the foundation.". Summer social practice is an important training link for colleges and universities in China to guide students to take root in the motherland, keep up with the needs of the times and cultivate professional knowledge in the direction of serving the people and contributing to the society. In social practice, college students can effectively integrate book knowledge and social knowledge to overcome the "weak participation dilemma" of students' lack of initiative and deepen their understanding of society. The majority of young students' understanding of Chinese society largely depends on the theoretical knowledge in books. However, the continuous growth of China's economy and the practice of system transformation and social structure transformation pose many challenges to the existing western theories. Only by going deep into Chinese society and understanding the specific texture of Chinese experience can we find the direction to effectively solve problems. Understanding China is the premise of serving China. The modernization drive requires the efforts of young students. To grow into a pillar of the country, we must not only read thousands of books, but also travel thousands of miles. The broad masses of young people should go deep into practice and practice hard. Practice makes true knowledge. Understanding begins with practice and must return to practice. "From practice to practice" is the basic of the CPC's mass line and investigation