GB/T 45468-2025 "Micro-beam analysis, focusing Ion beam-sem three-dimensional imagery analysis method for rock micro-pores" is an important standard for rock micro-pore research. The standard clarifies the technical process of using focused Ion beam-sem (FIB-SEM) for three-dimensional imagery analysis of rock micro-pores, covering the scope of application, principle, instrumentation, sample preparation, imagery and analysis steps, etc., providing a standard method for accurately exploring rock micro-pore structure, and assisting research and application in geological exploration, materials science and other fields.