Aimed　at　the　shortage　of　requiring　a　large　amount　of　memory　and　time　in　structure　dynamic　calculation,　a　method　of　optimizing　seismic　analysis　was　proposed,　which　based　on　reducing　data　points　and　increasing　sample　interval.　The　paper　takes　a　three-story　frame　structure　for　example,　applying　Mode　Analysis　Method　for　testing　and　verifying　the　effects.　The　results　demonstrate　that　method　of　wavelet　adjustment　for　seismic　wave　is　effective　and　reliable.　Under　the　high　accuracy　condition,　it　can　achieve　the　purpose　of　reducing　dynamic　computation　and　cutting　down　calculative　time,　consequently　improve　calculative　efficiency.　Combining　each　facet　of　conditions,　flow　chart　of　using　wavelet　to　design　seismic　wave　for　optimizing　preliminary　seismic　analysis　was　given　out.　©　2010　IEEE.