This　paper　analyzed　the　strong　motion　characteristics　based　on　86　three-component　strong　motion　records　of　the　MW　6.6　Luding　earthquake.　Additionally,　the　factors　that　influence　the　variation　in　ground　motion　for　three　earthquakes　with　similar　magnitude　in　Sichuan　Province　were　investigated.　The　analysis　result　indicates　a　strong　correlation　between　the　observed　ground　motion　parameters　and　the　distribution　of　published　Modified　Mercalli　Intensity.　The　residual　analysis　reveals　that　the　spectral　accelerations　at　periods　0.1-10.0　s　are　amplified　to　0.0798-0.3057　times　the　mean　level　in　the　rupture　forward　direction　and　weakened　to　0.0738-0.2831　times　the　mean　level　in　the　rupture　backward　direction.　The　maximum　pulse　direction　recorded　by　the　51LDJ　station　is　N6　degrees　E,　aligning　with　the　vertical　fault　direction.　The　velocity　pulses　has　distinct　bidirectional　pulses　in　the　waveforms,　with　a　PGV　of　37.0　cm/s.　The　source　effect　of　the　strike-slip　MW　6.6　Luding　and　MW　6.5　Jiuzhaigou　earthquakes　on　ground　motion　is　relatively　less　significant　compared　to　the　average　level　of　mainshocks　in　southwest　China.　However,　the　thrust-fault　MW　6.7　Lushan　earthquake　exhibits　a　stronger　source　effect　on　ground　motion　during　short　and　medium　periods,　but　a　weaker　source　effect　during　long　periods　when　compared　to　the　average　level.　The　anelastic　attenuation　of　the　Longmenshan,　Xianshuihe,　and　Huya　fault　zones　in　Sichuan　exhibits　significant　regional　variation　and　periodic　correlation.　This　phenomenon　is　closely　linked　to　the　regional　tectonic　background　variations　and　the　heterogeneity　of　crustal　structure　within　the　area.