The bridge is 32M long under which there is a while jade caldron.As a historical story goes,Dayu made nine caldrons,one of which fell into the Sishui River of Pengcheng in the Spring and Autumn Period.When Emperor Qin Shihuang toured the cast,heordered 1000 people to retrieve from the river but failed.Today the river has erystal water,which is believed to be a result of the emergence of this caldron.So the bridge got this name.