Numerical　simulation　has　become　a　useful　approach　to　explore　the　complex　physical　and　chemical　process　inside　the　supercritical　water　(SCW)　fluidized　bed　reactor.　Due　to　the　drastic　and　non-linear　variation　of　water　properties　near　pseudocritical　point,　the　flow　field　and　drag　coefficient　of　SCW　flow　past　a　cold　particle　are　considerably　different　from　that　of　conventional　flow.　Therefore,　in　this　work,　particle-resolved　numerical　investigation　is　conducted　to　study　the　flow　field　and　drag　characteristics　under　the　influence　of　the　special　water　properties　variation.　Through　varying　the　enthalpy　corresponding　to　the　particle　surface　temperature,　which　will　be　called　the　particle　surface　enthalpy　for　short,　in　a　wide　range,　it　realizes　the　study　under　different　properties　variation　tendencies.　The　simulated　results　demonstrate　that　the　variations　of　drag　coefficient　versus　Reynolds　number　(Re)　and　particle　surface　enthalpy　are　in　good　regularity　when　taking　the　freestream　temperature　as　reference　temperature.　The　drag　coefficient　is　enhanced　greatly　at　high　enthalpy　difference　between　particle　surface　and　inflow,　and　the　enhancement　is　mainly　contributed　by　that　of　the　frictional　drag　coefficient.　Moreover,　the　drag　coefficient　variations　under　different　pressures　are　in　good　agreement　when　cases　are　set　with　the　same　inflow　and　particle　surface　enthalpies,　respectively.　By　fitting　the　simulated　results,　a　new　drag　coefficient　correlation　is　developed　for　Re　range　of　10–200　with　consideration　of　the　influence　of　the　special　properties　variation.　The　fitting　quality　is　good　that　the　maximum　deviation　between　the　new　correlation　and　simulated　data　is　13.92%,　and　the　mean　deviation　is　3.67%.　©　2020,　Science　China　Press　and　Springer-Verlag　GmbH　Germany,　part　of　Springer　Nature.