Ontology,　as　a　knowledge　representation　approach,　continues　to　evolve　over　time　as　the　domain　develops.　It　is　of　particular　importance　when　introducing　ontologies　into　the　information　integration　field,　to　eliminate　semantic　conflicts　brought　about　by　changes　along　the　time　axis.　This　paper　first　introduces　a　temporal　ontology　model　which　can　be　used　to　express　and　deal　with　time　related　information,　then　defines　a　set　of　rich　query　operators　and　a　basic　reasoning　operator.　Further,　a　prototype　Temporal　Ontology　Management　System　(TOMS)　enhanced　with　the　above　operators　is　applied　to　an　information　integration　background　with　temporal　semantic　conflicts.　Testing　shows　that　TOMS　is　both　capable　of　managing　temporal　ontologies　and　supporting　temporal　queries　and　basic　reasoning.