A watchtower is generally the highest and strongest building in a village. After climbing onto its top, people can overlook the whole village and beyond to effectively monitor what happens inside and outside the village. In modern times when fire control devices such as watercart and squirt gunswere added,. the watchtower also has the functions of telling time, preventing fire and guarding against thieves and bandits. Tohelp support the family, Sun Dacheng, the father of Dr. Sun Yat-sen, not onlyspent a long time doing farmwork in the day, but also worked as the night watchman of the village at night.