Abstract: In order to study the rock deformation of underground cavities in Baihetan Hydropower Station, the data from multi-point displacement meter, acoustic wave test, and high precision micro-seismic monitoring were comparatively analyzed. And on this basis, the characteristics of damaged zone and deformation patterns during the excavation of the underground plants on right bank were summarized. The results showed that the increasing rate of surrounding rock deformation was closely related to the excavation intensity; the upstream wall displacement of the main powerhouse was larger than that of the downstream wall. The bedding joint of the upstream side is more than that of the downstream side, which was the main contribution to the deformation differences between upstream and downstream. The research results provided important references for next excavation and reinforcement of underground caverns on the right bank of Baihetan Hydropower Station.