A　dataset　of　719　three-component　accelerograms　recorded　at　102　strong　motion　stations　during　2008　and　2015　were　used　to　calculate　the　high-frequency　attenuation　parameter　(κ)　of　Yunnan,　China　by　adopting　the　spectral　decay　method.　Then,　the　characteristics　of　κ　were　studied.　According　to　the　geographical　distribution　of　selected　stations　and　earthquakes,　Yunnan　was　divided　into　southwestern,　southeastern,　central,　and　northeastern　regions,　the　obtained　site-components　of　horizontal　κ(κ0h)　were　0.0467,　0.0373,　0.0429,　and　0.0376s,　respectively.　A　tendency　that　κ0h　increased　from　north　to　south　was　observed.　Based　on　a　simplified　two-layered　crustal　model,　the　frequency-independent　quality　factor　(QI)　of　each　region　was　derived　from　the　path-component　of　horizontal　κ(m),　and　the　QI　values　were　varying　from　1199~1506.　The　result　shows　that　QI　of　the　southeastern　and　northwestern　regions　were　larger　than　those　of　northwestern　and　central　regions,　and　all　of　them　were　significantly　lower　than　that　of　the　Sichuan　basin　and　western　Sichuan　plateau.　These　observations　were　coinciding　with　previous　studies.　Finally,　κ0h　and　m　of　the　102　stations　were　calculated.　The　κ0h　values　were　varying　between　0.0041s　and　0.0639s　with　an　average　value　of　0.0419s.　The　m　values　were　varying　between　0.0000812s/km　and　0.0003475s/km　with　an　average　value　of　0.0002049s/km.　These　results　indicate　that　both　κ0h　and　m　of　Yunnan　has　significantly　horizontal　heterogeneity.　The　κ0h　and　m　values　obtained　in　this　article　could　benefit　the　studies　such　as　strong　ground　motion　simulation　and　development　of　ground　motion　predication　equations　in　Yunnan.　©　2019,　The　Editorial　Board　of　Journal　of　Basic　Science　and　Engineering.　All　right　reserved.