Built during Tubo King Songtsen Gampo period in the 7th century, the Trandruk Monastery (Chinese:昌珠寺；pinyin:chāngzhūsì) is situated at the east bank of the Yalong River in the south of the Shannan Prefecture in Tibet. It is Tibet's oldest Buddha worship hall, with a history of over 1,300 years.
Its long history and magnificent architecture attract thousands of pilgrims to worship in the monastery. The 5th Dalai Lama and his successors came here to offer incense to Buddha at certain time every year. on a regular basis to the ceremony Tim Shannon. As one of the three scared monastery in Shannan Prefecture, Changzhu Monastery enjoys a high standing in the hearts of the faithful pilgrims.

In Tibetan, "Chang" means a big roc bird and "Zhu" means dragon, so the Changzhu Monastery means the honorable monastery.

Its main constructions include the Coqen Hall enshrining the statues of Songtsen Gampo, Sakyamuni, and Guanyin Bodhisattva, and a winding corridor with many scriptures carved on the wall. The hall on the second floor of the Coqen Hall enshrines the statue of Indian Master Padmasambhava.
The Coqen Hall still boasts a lot of statues and mural paintings in the hall. The most attractive is the Pearl-made Tangkha (a kind of embroidery), made of 29,026 pearls, 1 diamond, 1 ruby, 1 sapphire, and 15 grams of gold. It is a miracle to see it have passed down from generation to generation without being damaged or lost during political struggles and wars.

In 1961, the State Council listed the Changzhu Monastery as a key relic under state protection.