Abstract: The use of CT (Computed Tomography) technology can perform non-destructive testing without destroying the core, which is beneficial to the comparison of effects, quantitative analysis and visual observation of the location and extent of fracturing fluid reservoir damage. The experimental results show that the poor physical properties of tight reservoirs are the root cause of reservoir damage, and the interaction between fracturing fluid and reservoir is the damage triggering factor. The qualitative, quantitative and visual analysis ability of CT technology can more directly reflect the position and extent of the above-mentioned damage, which can effectively testify the data obtained by other analytical methods, and provide experimental means and theoretical basis for fracturing fluid damage research.