During the summer vacation, what worries Zhaxi Naoba the most is the trees he manages on campus. "On the first day of school, I will go to the nursery base to weed and water my small trees." In his new life in fifth grade, Zhaxi Naoba will start by watering the green trees. Zhaxi Naobu is a fourth grade student at the Central Boarding School in Bagan Township, Qumalai County, Yushu Tibetan Autonomous Prefecture, Qinghai Province. Qumalai County is located on the Qinghai Tibet Plateau, where the main source of the northern source of the Yangtze River originates. Located at the source of the Yangtze River, caring for the ecology and protecting the environment are compulsory courses for students at the Bagan Township Central Boarding School. In 2013, Bagan Township Central Boarding School moved into the new campus. At the beginning of its construction, the campus planned to retain the original lawn on all plots except for hardened roads and buildings. The children went to school from pastoral areas to townships, and considering that they were temporarily unable to adapt, they kept the original lawn. "Dan Ga, the party branch secretary of the central boarding school in Bagan Township, said," Hardening the roads is not difficult, but it is not easy to restore them to lawns. "Being close to nature and allowing children to study happily has become the school's educational philosophy. At the beginning, teachers all handwritten environmental lesson plans, incorporating specialized courses such as "Understanding Environmental Labeling", "Learning Garbage Classification", and "Understanding the Source of Three Rivers". Gradually, the concept of ecological and environmental protection is integrated into all aspects of the curriculum. The teacher leads the children to conduct scientific experiments to understand the photosynthesis of plants, observe flowers and plants on campus, and record the "flower and plant log". From books to practice, outside the classroom, children read the book of nature and use their actions to depict new patterns on it. The average elevation of Qumalai County is 4550 meters, and the oxygen content in the air is only 40% of that in plain areas. It is very difficult to plant a tree here. Relying on the relatively good soil and water conditions in Bagan Township, the school constructed a small nursery base in 2018 using Qinghai spruce and black willow donated by the Qinghai Forestry and Grass Department, and began exploring seedling planting. Students from third grade and above each claimed a tree and were responsible for taking care of the saplings, watering and pruning the branches. After graduation, the small tree was handed over to younger children. Children treat small trees as their friends and take good care of them. The first thing they do when they arrive at school every day is to water the saplings. Some saplings are frozen to death, and children will even run to the teacher's place crying. This is a very good textbook, where children understand the difficulty of protecting the ecology and cultivate their confidence to become more courageous as they struggle, "said Dan Ga. In the past 5 years, the survival rate of Qinghai spruce and black willow in the school has reached over 95% and 90% respectively. The children's efforts have been rewarded, and the successful experience of planting trees in the school has also been promoted to the entire township. Under the silent environmental education, children have brought the concept of protecting the environment back home. During the annual Cordyceps sinensis season, children spontaneously write environmental protection flyers to remind people to clean up the garbage generated while digging for Cordyceps sinensis in a timely manner. They also take the initiative to pick up the garbage on the grassland and string the plastic bottles and bags they pick up to hang on their bodies. People who see it say it is the "most beautiful ecological necklace". The selection of environmental protection guardians, the establishment of environmental protection drama festivals, and the production of garbage collection bags... The ecological and environmental protection classroom of the central boarding school in Bagan Township has moved from the school to a broader world, where the source of