In order to protect Longmen Grottoes and to control water seepage into Qianxi temple,the rock structure and water seepage channels need to be found.The rock structure was investigated by on-site investigation and physical exploration of the cave using physical detection methods.These studies revealed the potential rock mass structure of Qianxi temple Cave area and the seepage channels.This research helps not only to understand the mechanism of the water damage at Qianxi Temple,but also suggests ways to prevent water damage at Qianxi temple,and to investigate seepage problems in other similar caves.