Hilbert-Huang　transform　(HHT)　is　a　new　method　for　dealing　with　non-linear　and　non-stationary　data.　By　using　this　method,　any　signals　can　be　decomposed　into　a　finite　number　of　intrinsic　mode　functions　(IMF)　and　then　Hilbert　spectrum　is　obtained　by　Hilbert　transform.　In　this　paper,　the　new　method　is　used　in　extracting　dynamic　properties　of　seismic　signals.　The　energy　time-frequency　distribution　can　be　effectively　acquired.　Several　dynamic　properties,　such　as　center　frequency,　instantaneous　phase,　instantaneous　energy,　Hilbert　energy　and　time-frequeney　distribution　with　respect　to　maximum　amplitude　are　extracted.　In　addition,　by　comparing　HHT　with　Fourier　transform　and　wavelet　transform,　the　advantage　of　HHT　and　its　considerable　significance　for　structural　analysis&　structural　control　are　shown.