This　article　proposes　a　risk　assessment　method　based　on　interval　intuitionistic　integrated　cloud　Petri　net　(IIICPN).　The　cloud　model　is　widely　used　in　data　mining　and　knowledge　discovery,　especially　in　risk　assessment　problems　with　linguistic　variables.　However,　the　cloud　models　proposed　in　the　literature　do　not　express　interval-valued　intuitionistic　linguistic　satisfactorily,　and　the　reasoning　methods　based　on　the　cloud　models　cannot　perform　risk　assessment　well.　The　work　in　this　article　includes　the　definition　of　IIIC　and　IIICPN,　the　method　of　converting　the　interval-valued　intuitionistic　uncertain　linguistic　numbers　into　IIIC,　and　the　reasoning　method　of　IIICPN.　As　proofs,　a　subway　fire　accident　model　is　adopted　to　confirm　the　feasibility　of　the　proposed　method,　and　comparison　experiments　between　the　IIICPN　with　general　fuzzy　Petri　net　and　the　trapezium　cloud　model　are　conducted　to　verify　the　superiority　of　the　proposed　model.　IEEE