According to Tibet Library, National Key Ancient Books Protection Office of Norbulingka Park in Lhasa City, capital of southwest China's Tibet Autonomous Region, has completed general investigation of 745 ancient books since it carried out general investigation of ancient books and movable cultural relics in September 2018.

Among the 745 ancient books registered in the general investigation, 361 ancient books preserved in Norbulingka’s New Palace, 19 ancient books preserved in Kelsang Potrang Palace, 151 ancient books preserved in Chensal Potrang Palace, 117 ancient books preserved in Kelsang Dekyi Potrang Palace and 97 ancient books preserved in Norbulingka’s Shadan Lagang Temple.

Nyishar, director of the ancient books department of the Tibet Library, introduces that several pages of some ancient books and documents are stuck together or damaged by worms, while some ancient string-bound paper books fall apart. In the process of general investigation, workers strictly follow the standard general investigation process of ancient books and movable cultural relics, carry out punctuation collating and dedusting to these books, and registers damage situation on the computer and paper notebooks in detail.

In addition, workers equip 343 packing cloth for the books, and invite Tibetan calligraphers to write 250 head labels for these lost-label documents. At present, they are carrying out the general investigation and  register of ancient books in Zhunzeng Potrang Palace, thelargest collection of ancient books.

Nyishar says, "The general investigation of ancient books is the first joint work of the management department of movable cultural relics and the general investigation department of ancient books. Two departments have clear divisions of work and cooperate together, which avoids the secondary damage to the ancient books and documents caused by repeated censuses in the future, and also provides important general investigation experience for other key collecting departments."