Fine　aggregate　is　one　of　the　essential　components　in　concrete　and　significantly　influences　the　material　properties.　As　parts　of　natures,　physical　characteristics　of　fine　aggregate　are　highly　relevant　to　its　behaviors　in　concrete.　The　most　of　previous　studies　are　mainly　focused　on　the　physical　properties　of　coarse　aggregate　due　to　the　equipment　limitations.　In　this　paper,　two　typical　fine　aggregates,　i.e.,　river　sand　and　crushed　rock,　are　selected　for　shape　characterization.　The　new　developed　digital　image　analysis　systems　are　employed　as　the　main　approaches　for　the　purpose.　Some　other　technical　methods,　e.g.,　sieve　test,　laser　diffraction　method　are　also　used　for　the　comparable　references.　Shape　characteristics　of　fine　aggregates　with　different　origins　but　in　similar　size　ranges　are　revealed　by　this　study.　Compared　with　coarse　aggregate,　fine　grains　of　different　origins　generally　have　similar　shape　differences.　These　differences　are　more　significant　in　surface　texture　properties,　which　can　be　easily　identified　by　an　advanced　shape　parameter:　bluntness.　The　new　image　analysis　method　is　then　approved　to　be　efficient　for　the　shape　characterization　of　fine　aggregate　in　concrete.