The　effects　of　evolutionary　Arias　intensity　are　thoroughly　investigated　based　on　ground　motion　simulation　and　nonlinear　dynamic　response.　A　new　methodology　is　developed　to　generate　a　series　of　spectral-equivalent　synthetic　motions　with　different　energy　accumulation　paths　using　wavelet　packets.　Systematic　studies　are　performed　on　dynamic　responses　of　hysteretic　systems　and　liquefiable　grounds　using　the　simulated　motions　and　actual　recordings.　An　attempt　is　made　to　develop　the　relationship　between　liquefaction-induced　deformation　and　shaking　intensity　rate　which　is　used　to　quantify　the　rate　of　Arias　intensity　accumulation.　The　results　indicate　the　need　of　considering　evolutionary　Arias　intensity　in　nonlinear　dynamic　analysis.