In　this　paper,　a　method　was　developed　to　link　the　band-pass　filtering　technique　with　the　time　and　frequency-domain　modal　identification　method　by　using　the　random　decrement　technique　in　combination　with　Hilbert-Huang　transform.　The　proposed　method　improved　the　accuracy　and　reliability　of　parameter　identification　by　effectively　avoiding　mixed　frequencies　that　occurred　during　signal　decomposition.　The　validity　of　this　method　was　verified　by　identifying　the　frequency　and　damping　ratio　of　the　IASC-ASCE　structural　health　monitoring　benchmark　structure.　The　results　indicated　that　the　identification　error　can　be　reduced　by　combining　the　RDT　with　EMD　to　process　the　time　sequences　that　resulted　from　filtering　the　specific　ranges　of　frequencies　of　structural　earthquake　time　histories　by　using　the　HHT　method.　Therefore,　the　proposed　method　can　be　applied　to　other　modal　identification　techniques.