Abstract: According to the rock mass structure theory, weak structural face plays a prior control role in rock mass deformation and fracture. It is different in seismic wave propagation characteristics (velocity and attenuation) from surrounding intact rocks, so we can use seismic tomography to determine the spacfial location of weak structural face, and hence to study structural characteristics of rock mass. For study of rock mass structure, we combined the seismic wave travel time tomography and the seismic wave attenuation tomography into an integrated method for detecting weak structural interfaces occuring in rock mass.