In　order　to　correctly　evaluate　urban　comprehensive　disaster-carrying　capability　and　then　to　establish　scientific　basis　for　disaster　prevention　and　reduction,　a　fractal　method　for　urban　comprehensive　disaster-carrying　capability　is　proposed　on　the　basis　of　system　principle　which　is　that　structure　determines　function.　The　fractal　dimensions　of　29　cities　are　calculated　and　analyzed.　The　results　show　that　relative　stronger,　middling　and　weaker　are　respectively　13.79%,　65.52%　and　20.69%,　which　are　completely　consistent　with　the　actual　situation.　So　the　method　can　construct　a　characteristic　index,　and　the　main　impact　effects　can　be　analyzed　according　to　the　result.　Tested　by　examples　together　with　the　other　two　methods,　i.e.　the　fuzzy　assessment　method　and　exponent　method,　the　results　verify　effectively　that　this　method　is　useful　and　feasible.