Urban　comprehensive　disaster　prevention　and　mitigation　capability　can　be　measured　not　only　a　city　in　the　face　of　disaster　resilience　and　recovery　capability,　but　also　is　an　important　basis　for　supporting　urban　safety　and　mitigation　decision-making.　Firstly,　Evaluation　index　system　for　urban　comprehensive　disaster　prevention　and　mitigation　capability　was　presented　in　terms　of　urban　disaster　hazard,　disaster　vulnerability　and　disaster-carrying　capability.　Meanwhile,　the　grading　standards　of　evaluation　index　were　also　given.　Secondly,　the　practical　probability　method　was　proposed　to　evaluate　the　levels　of　urban　comprehensive　disaster　prevention　and　mitigation　capability　based　on　probability　theory.　Finally,　examples　were　provided　to　validate　and　prove　its　efficiency　and　feasibility.