An undated photo shows the Potala Palace in Tibet's capital of Lhasa, photo from Xinhua.

"The railings are used to protect the murals in the Potala Palace because some pilgrims and visitors like touching them," Juedan told the reporter.

As a defender and maintenance worker, Juedan undertakes to protect the priceless cultural heritage in the Potala Palace, the symbol of Tibet.

For a long time Juedan and his colleagues have tried their best to keep the originality of the palace and they even have set strict restrictions to the number of lampwicks inside the palace.

"The murals have gone through for ages and are easily blackened by the smoke of butter lamps. For example, there should be no more than 17 lampwicks in this hall,"Juedan introduced.

The murals are only part of the protection effort and there are also a great array of Buddhist scriptures.

In order to protect the cultural and religious legacies, Juedan and his colleagues are busy sorting out and archiving the scriptures.

The oldest hall in the Potala Palace has a history of more than 1,300 years. The Central Government has always paid close attention to maintaining and protecting the palace, Juedan said.