Photo taken on Aug 5, 2016 shows masks used in Tunbao opera performance at a mask festival held in Anshun of Southwest China's Guizhou province. A three-day mask festival kicked off here Friday. The Tunbao people, who reside around the city of today's Anshun, are descendent of garrison troops sent by Zhu Yuanzhang, the first emperor of the Ming Dynasty (1368-1644), to the area 600 years ago to suppress and prevent rebellions by ethnic minorities. The culture of Tunbao is a unique one in Han culture as a whole. [Photo/Xinhua]