Abstract: in order to study the micro pore structure features of the coal mass and the meso defomation law ofthe adsorbed gas loaded coal a low prssure liquidntrogen adsoption and SEM were applied to study the pore type and pore sze distribution of thecoal mass.Aloaded CT scaming deviceof the adsorption gascoal ma5s was researched and developed.The indutrial CT scanning was appied to observe the meo defomation processing ofthe adsoptiongascdl massin the loadingprocess.The results showed that the pore on the coalsuriace would be a cylindrica. narow gap.wedge iniootle type pore and others.According to the comecion ypes of the intenal pore the pores could be divided into atoll w- through hole intenal comected hole,one end closed hole and cosed hole. undest thedfiferent stesscondition.the CT images showed that the cal internal was in inhonogeneityth pore representation was in heterogeneaous distribution features and the loaded falure porein the adsoroedgas coal mass aso woud be in heerogeneous featres. nder the loaded conditon.the adsoption gas coal mass would have a swelling effect and a shrinking effect locally:cenfrllythe presentation would be the swelling effect and was caused due to the muti pore and inhomogeneit .The stuty resulis revealed themicro structure and deformation features of the coal mass which could provide the meso means and studly base to study the falire nechanis nof the gassy coal and outburst disaster dynamic process.