Abstract: Based on the digital photogrammetry, the spatial searching for all blocks in a disturbed zone of rock mass was discussed, and a new searching technique was proposed for the identification of blocks. With the searching technique introduced into the 3D digital analysis system-the three-dimensional geotechnique structural modeling and analysis system (GeoSMA-3D) developed by ourselves, the spatial searching for all blocks is available to rock excavation. A numerical example showed that the system has the advantages of adding structural planes dynamically and modeling the geometrically complex excavation process. Moreover, the system is easy to implement the operation of software via data input through man-machine interface or documental representation, graphical representation of computed results and interfacing with general-purpose graphical software, such as AutoCAD. Therefore this method shows its strong commonality and reliability, and it can also be used for rock tunnel excavation process advanced prediction and reinforcing scheme optimization.