早期由于构造运动，地壳抬升，岩体节理裂隙发育。地下水长期溶蚀山体，将山体内部掏空，形成地下溶洞。在水流长时间冲刷作用下，溶洞所在山体逐渐被溶蚀、坍塌，最终前后相通，后因地壳再次抬升、地下水位下降而逐渐出露于地表。 In the early stage, due to tectonic movements, the crust was uplifted, joints and fissures in the rock were developed. Because of long-term dissolution of groundwater to mountain, the inner part of mountain was empty and the underground karst cave was formed. Under the long-term scouring of flowing water, the mountain with karst cave was gradually eroded and collapsed. Finally, the front and back parts of the mountain were connected. Then as the crust was uplifted again, the groundwater level dropped and the karst cave was exposed.