In　this　paper,　several　disintegration　tests　were　conducted　in　different　acid　and　alkali　solutions　and　their　results　were　analysed.　A　theoretical　model　based　on　the　principle　of　similarity　and　the　conservation　of　mass　were　proposed　to　describe　the　relationship　between　the　number　of　disintegration　cycles　and　the　particle　size　distributions.　Using　this　model,　the　fractal　evolution　of　the　disintegration　of　clay　shales　under　different　pH　conditions　were　evaluated　and　the　results　show　that　the　fractal　dimension　of　clay　shale　disintegration　is　greater　at　initial　cycles　in　acidic　solutions　compared　with　that　in　alkaline　solutions,　All　fractal　dimensions,　however,　approach　the　same　value　given　enough　number　of　disintegration　cycles　but　more　cycles　are　needed　in　alkaline　solutions　for　the　value　of　fractal　dimension　to　become　stable.　Another　theoretical　model　was　also　proposed　in　this　paper　to　evaluate　the　incremental　surface　energy　and　cumulative　incremental　surface　energy　of　clay　shale　disintegration　based　on　the　principle　of　energy　dissipation.　And　the　relationships　between　the　cumulative　incremental　surface　energy　and　the　pH　value　were　obtained　for　the　case　study.　It　was　found　that　all　curves　have　the　same　attenuation　trend,　and　the　absolute　incremental　surface　energy　decreases　as　the　disintegration　cycle　increases.