Abstract: Deformation bans in porous sandstones is of great significance in revealing their related geological processes and engineering applications. Its microstructure is the key point of its related scientific and engineering research. Conventional methods of rock micro structural analysis have some limitations in comprehensively analyzing the internal microstructures of rocks. Three-dimensional X-ray micro-imaging technology developed in recent years can acquire three-dimensional fine digital images of micro-scale inside rocks nondestructively. It is an effective means to establish and analyze rock microstructures. High resolution three-dimensional micro structural image of deformation band in porous sandstones was established by scanning the deformation band with three-dimensional X-ray microscopy. The micro structural characteristics of deformation band in porous sandstones were analyzed by using continuous slice images. Based on the analysis of micro-occurrence zones and particle breaking process of deformation band, a complete time series of grain breaking-broken particles and residual broken particles rearrangement-local particle breaking zones-weak particle breaking deformation zones-strong particle breaking deformation zones-strong and weak particle breaking deformation zones-cluster deformation zones was established.