As　part　of　a　broader　effort　to　develop　ground-motion　data　resources　for　China　in　a　manner　consistentwith　Next　Generation　Attenuation　projects,we　develop　a　database　of　geotechnical　soil　profiles　and　shear-wave　velocity　(VS)　logs　for　sites　having　ground-motion　accelerometers　(this　database　is　referred　to　as　soil　profile　database　[SPD]),　and　then　use　that　data　to　develop　site　parameters.　The　site　information　is　compiled　for　stations　within　the　National　StrongMotion　Observation　Network　System(NSMONS)　of　China.　This　effort　is　focused　on　four　provinces　in　western　China　(Yunnan,　Sichuan,　Gansu,　and　Xinjiang),　which　contribute　871　of　2023　NSMONS　stations　throughout　China.　Of　the　871　sites,　the　SPD　provides　site　information　for　678　sites,　or　78%　of　the　total.　To　develop　the　SPD,　geotechnical　logs　and/or　VS　profiles　are　compiled　for　637　sites.　This　information　is　derived　from　previously　unpublished　reports　and　is　assembled　here　in　a　uniform　format　and　partially　disseminated　(only　approximate　site　locations　are　provided).　The　remaining　41　sites　in　the　SPD　have　confirmed　bedrock　conditions　at　the　ground　surface.　Site　metadata　and　parameters　are　compiled　into　a　database,　included　as　a　supplemental　material　to　this　article,　that　includes　the　depth　to　the　first　occurrence　of　0.5　km/s　shear-wave　velocity　(Z0:5),　three　time-averaged　shear-wave　velocity　parameters　(VSe,　VS20,　VS30),　and　site　classifications　based　on　the　Chinese　building　seismic　design　code　and　National　Earthquake　Hazards　Reduction　Program　Provisions.　For　sites　with　VS　profiles　that　do　not　extend　to　30　m,　we　present　region-specific　recommendations　for　extrapolating　time-averaged　velocities　from　the　profile　depth　to　30　m.　For　sites　with　geotechnical　logs　but　no　profiles,　we　present　procedures　to　estimate　VS　profiles　from　which　the　earlier　parameters　can　be　derived.　©　2022　Seismological　Society　of　America.　All　rights　reserved.