This　study　used　306　accelerograms　recorded　at　22　strong-motion　stations　to　investigate　the　source　parameters,　quality　factor　(Q),　and　site　effects　of　S-wave　Fourier　acceleration　amplitude　spectrum　(FAS)　of　the　2019　M-s　6.0　Changning　earthquake　sequence　in　China　with　surface-wave　magnitudes　(M-s)　of　4.1-6.0.　The　generalized　inversion　technique　(GIT)　was　adopted.　The　inverted　stress　drop　of　the　mainshock　was　1.15　MPa,　and　those　of　the　aftershocks　varied　from　0.11　to　1.04　MPa　with　an　average　value　of　0.43　MPa.　The　M-s　of　these　earthquakes　were　larger　than　M-w　with　an　average　magnitude　difference　of　0.22.　The　inverted　Q　values　increase　rapidly　with　frequencies　at　0.5-4.0　Hz　from　62　to　2920　and　become　less　dependent　at　4.0-25.0　Hz.　Such　a　phenomenon　indicates　that　the　propagation　path　attenuation　mechanism　transited　to　intrinsic　at　high　frequencies.　A　bilinear　Q(f)　model　for　which　Q(f)　=237.6f(1.27)　(Q＜　1280)　and　Q=1280　at　higher　frequencies　was　obtained.　The　high-frequency　attenuation　model　of　the　study　area　was　kappa　=　0.0420　+　0.0001262R.　The　inverted　site　responses　of　the　22　stations　were　compared　with　those　calculated　using　the　horizontal-to-vertical　spectral　ratio　(HVSR)　method.　In　general,　the　amplification　curves　of　most　stations　obtained　with　the　GIT　were　similar　to　those　of　HVSR,　and　the　amplification　levels　were　relatively　higher.　Contrarily,　obvious　discrepancies　were　observed　between　the　results　estimated　from　the　two　methods　at　several　stations.　Such　effects　were　attributed　to　the　limitation　that　the　majority　of　the　stations　were　distributed　along　the　boundary　of　the　basin　and　mountainous　areas,　and　the　inverted　Q　values　were　representative　of　the　specific　area　rather　than　the　pure　basin　and　mountainous　areas.　Finally,　a　nonlinear　soil　site　effect　was　observed　at　51GXT　in　earthquakes　with　peak　ground　acceleration　greater　than　300　cm/s(2).　The　nonlinearity　obviously　aggravated　the　site　amplification　at　1.0-5.0　Hz.