Abstract: Aiming at safety monitoring and 3D visualization expression of rock blocks in underground powerhouse of hydropower engineering, we established a 3D visualization monitoring software of rock blocks by using BIM+ 3DGIS technologies.The monitoring software can reflect space information of blocks and geometric shape in high-resolution terrain scene, also it candisplaylocation of monitoring gauges, incorporate the BIM model of workshops and associate monitoring data, realizing pre-warning for blocks in 3D visualization environment.The monitoring software has greatly improved the effectiveness of safety monitoring in right-bank underground workshop in the Three Gorges Hydropower Station.The relevant experience could provide some referential values for the 3D visualization monitoring and management of the water resources and hydropower projects.