Abstract: This paper proposes a method for analyzing the damage evolution of layered composite rock masses based on CT (computed tomography) scanning technology. This method calculates the normal component and tangential component of the interaction force between the particles based on the collision between the particles of the rock mass, thereby establishing a rock damage analysis model. It also set fixed nodes and utilized CT scanning technology to scan the rock sample. The CT image is used to obtain the damage characteristics of the rock mass; the creep parameter of the rock mass is introduced according to the interlayer stress model, and the evolution rule of the rock mass damage is analyzed through the calculation principle of the linear regression equation. The experimental test results show that, compared with the traditional analysis method, the damage data obtained by this method is accurate, the analysis of the damage evolution law of the rock mass is consistent with the actual situation and this method meets the requirements of rock mass damage law analysis.