Ancient mechanical clocks and watches are the product of multiple disciplines. They show the cultural colors of different eras and also reflect the level of scientific and technological development in different periods. The restoration of ancient clocks and watches is to inherit the traditional restoration techniques and add some modern processing methods and scientific methods to protect the clocks and watches that have been in disrepair or damaged. Ancient clocks and watches are a relatively special type of collection in the Palace Museum. They are important relics reflecting the grand occasion of Sino-Western cultural exchanges in the court during the Ming and Qing Dynasties. The Palace Museum has more than 1,500 clocks and watches, ranging from the 17th century to the early 20th century. The existing ancient clock and watch restoration technology of the Palace Museum originated from the Clock Making Office of the Qing Palace Workshop. It is the only traditional skill that has been passed down from the Qing Palace to the present day and has never been interrupted. The Clock Making Office of the Qing Palace was the royal workshop. According to historical records, Emperor Kangxi summoned outstanding craftsmen from home and abroad to serve in the royal workshop in 1693. In the late Qing Dynasty and early Republic of China, after the Clock Making Office disappeared, a small number of maintenance personnel still worked in the palace, including Xu Wenlin, the first generation inheritor of the clock and watch restoration skills of the Palace Museum. The restoration of clocks and watches in the Forbidden City has continued the traditional master-apprentice system, which has been passed down from generation to generation, and now there is a fifth generation successor.