The　pore　structure　is　the　fatal　factor　which　influences　the　strength　of　cerhent　mortar　and　concrete.　A　lot　of　researches　on　the　relationship　between　the　strength　and　the　pore　structure　were　developed.　Initially,　porosity　is　the　only　factor　in　the　strength　models.　As　the　development　of　research,　it　is　illustrated　that　the　pore　size　distribution　also　has　significant　effect　on　the　strength.　The　pore　size　distribution　is　taken　into　consideration　in　the　strength　model　in　different　forms.　However,　these　models　are　still　unavailable　to　simulate　the　relationship　between　strength　and　pore　structure,　because　the　parameters　used　for　representing　the　pore　size　distribution　are　not　accurate　enough.　In　the　present　research,　strength　and　pore　structure　were　tested　on　thirteen　Portland　cement　mortar　mixtures　to　collect　the　original　data　of　the　strength　and　pore　structure.　In　order　to　enhance　the　reliability　of　the　strength　model,　the　pore　volume　and　the　pore　size　distribution　were　all　considered.　The　fractal　theory　was　employed　to　characterize　the　pore　size　distribution　more　accurately　than　ever　used　parameters.　According　to　the　regression　analysis　results,　the　fractal　dimension　of　pore　surface　and　the　capillary　pore　volume　were　respectively　selected　as　representative　parameters　of　pore　size　distribution　and　pore　volume.　The　research　results　indicate　that　the　relations　between　strength　and　fractal　dimension　and　capillary　pore　volume　present　positive　power　function　and　negative　power　function　respectively.　The　ratio　of　fractal　dimension　to　capillary　pore　volume　is　addressed　as　the　new　parameter　for　strength　model.　Finally,　relational　expression　of　power　function　is　proposed　between　the　compressive　strength　and　the　ratio　of　fractal　dimension　to　capillary　pore　volume.　Regression　analysis　indicates　that　the　strength　model　relative　to　pore　structure　addressed　in　this　study　has　high　prediction　accuracy.　(C)　2016　Elsevier　Ltd.　All　rights　reserved.