Gongzirong Primeval Forest is located in Dam Village, Tunggar Township, the north of Langxian County and north bank of the Yarlung Zangbo River, Tibet Autonomous Region. (Photo/ Xu Na)

The six forest rangers of Gongzirong are from Dam Village and Jiangcun Village. They patrol the forest in turns. (Photo/ Xu Na)

Nyima Tashi, a villager of Dam Village, is one of the forest rangers of Gongzirong. (Photo/ Xu Na)

Nyima Tashi and his colleagues are checking the equipments they take to patrol the mountain. (Photo/ Xu Na)

The ranger is filling the water bag. (Photo/ Xu Na)

Every morning, Nyima Tashi and the other five forest rangers set off for the areas they in charge. They tramp over the mountains and patrol in the forest, aiming to eliminate potential fire hazards and prevent poaching. (Photo/ Xu Na)

According to Nyima Tashi, the village launched the compulsory forest protecting ten years ago, and no forest fire has ever happed since then. (Photo/ Xu Na)

The rangers protect the animals in the forest like friends. (Photo/ Xu Na)

Life in the forest is tough and boring. The radio adds some fun to their life. (Photo/ Xu Na)