LN2　fracturing　improves　the　permeation　structure　of　the　reservoir,　but　the　lengthy　thawing　time　restricts　the　efficiency　of　CBM　development.　In　the　study,　efficient　pore　structure　modification　of　bituminous　coal　is　achieved　through　rapid　cycles　of　LN2　cold　soaking　and　microwave　thawing.　The　research　shows　that　the　microstructure　and　surface　morphology　of　the　coal　change　significantly　during　the　cycles,　including　the　increase　of　the　external　specific　surface　area　and　pore　volume,　and　accelerate　the　iteration　of　micromeso-macropores.　The　volume　increase　peak　of　mesopores　and　macropores　reaches　90.78%　and　101.42%　at　the　15th　and　20th　cycles,　which　further　confirms　the　development　of　the　pore　structure,　with　more　gas　adsorption/desorption　points　and　secondary　pores　beginning　to　appear.　In　addition,　the　heat-cooling　coupling　affects　the　damage　mechanism　of　the　coal　structure,　transitioning　from　crack　propagation　to　matrix　fracture　and　developing　into　the　trend　of　main　cracks　expanding　followed　by　convergence.　The　average　fractal　dimension　increases　by　26.23%-75.10%,　with　rapid　freeze-thaw　cycles　increasing　the　multiselectivity　of　gas-flow　channels.　The　findings　provide　a　reference　for　the　integration　and　optimization　of　anhydrous　fracturing　technology　for　coal　reservoirs.　©　2025　American　Chemical　Society.