The　research　to　identify　and　locate　the　damage　to　the　engineering　structure　mainly　aimed　at　some　simple　structure　forms　before,　such　as　beam　and　framework.　Damage　shows　changes　of　local　characteristics　of　the　signal,　while　wavelet　analysis　can　reflect　local　damage　traits　of　the　signal　in　time　domain　and　frequency　domain.　For　confirming　the　validity　and　applicability　of　structural　damage　identification　methods,　wavelet　analysis　is　used　to　spatial　structural　damage　detection.　The　wavelet　analysis　technique　provides　new　ideas　and　methods　of　spatial　steel　structural　damage　detection.　Based　on　the　theory　of　wavelet　singularity　detection,　with　the　injury　signal　of　modal　strain　energy　as　structural　damage　index,　the　mixing　of　the　modal　strain　energy　and　wavelet　method　to　identify　and　locate　the　damage　to　the　spatial　structure　is　considered.　The　multiplicity　of　the　bars　and　nodes　can　be　taken　into　account,　and　take　the　destructive　and　nondestructive　modal　strain　energy　of　Kiewitt-type　reticulated　shell　with　40m　span　as　an　example　of　numerical　simulation,　the　original　damage　signal　and　the　damage　signal　after　wavelet　transformation　is　compared.　The　location　of　the　declining　stiffness　identified　by　the　maximum　of　wavelet　coefficients,　analyzed　as　signal　by　db1　wavelet,　and　calculate　the　graph　relation　between　coefficients　of　the　wavelets　and　the　damage　to　the　structure　by　discrete　or　continuous　wavelet　transform,　and　also　check　the　accuracy　degree　of　this　method　with　every　damage　case　Finally,　the　conclusion　is　drawn　that　the　modal　strain　energy　and　wavelet　method　to　identify　and　locate　the　damage　to　the　long　span　reticulated　shell　is　practical,　effective　and　accurate,　that　the　present　method　as　a　reliable　and　practical　way　can　be　adopted　to　detect　the　single　and　several　locations　of　damage　in　structures.