In　order　to　improve　the　diagnosis　rate,　a　structural　damage　identification　method　based　on　modal　indices　and　data　fusion　was　proposed.　In　the　method,　multi-damage　indices　were　used　to　initially　diagnose　damage　on　basis　of　structural　vibration　responses.　The　weighted-average　algorithm　was　used　to　fuze　the　multi-damage　indices,　and　the　fusion　decision-making　and　damage　location　were　made　based　on　the　peak　value　method.　To　verify　the　feasibility　and　efficiency,　the　identification　of　both　single-　and　multi-damage　patterns　were　simulated　for　a　two-span　arch　bridge　of　concrete-filled　steel　tubes,　and　the　effect　of　noise　on　identification　accuracy　was　also　taken　into　account.　A　comparison　was　made　between　the　fusion　method　and　the　single　damage　index　method.　The　results　show　that　the　proposed　method　can　locate　both　single-　and　multi-damage　patterns,　and　excel　the　single　damage　index　method.