Introduction to Xiaoyu Cave: Xiaoyu Cave is located in Dam Yuyuan Scenic Area. Close to the dam site. It was formed in the limestone of the Lower Triassic Jialingjiang Formation on the southern flank of the Changning anticline. The undercurrent originates from Yunnan and discharges in the northeast direction. The upper section is developed on the fault zone and the lower section is longitudinal, with a total length of 5,600 meters. The main supply source is atmospheric precipitation in the limestone outcrop area.