Coal　will　continue　to　play　an　important　role　as　energy　source　in　the　near　future　in　China.　Traditional　combustion　utilization　of　coal　inevitably　produces　large　amounts　of　SOx,　NOx,　dust　and　greenhouse　gas,　which　are　main　causes　of　environmental　problems　such　as　haze　and　global　warming.　A　coal-to-hydrogen　power　generation　multi-generation　process　based　on　supercritical　water　gasification　was　originally　proposed　by　the　team　of　Liejin　Guo　at　the　State　Key　Laboratory　of　Multiphase　Flow　in　Power　Engineering,　Xi’an　Jiaotong　University,　China.　Coal　is　completely　gasified　in　a　supercritical　water　homogeneous　environment　to　produce　hydrogen-rich　mixtures.　The　hydrogen　is　completely　oxidized　to　form　supercritical　H2O/CO2　mixed　working　fluid　which　is　then　sent　into　the　turbine　for　power　generation.　The　exhaust　gas　from　the　turbine　is　separated　and　the　carbon　dioxide　is　further　captured.　The　development　status　of　the　key　technologies　in　the　schemes　were　reviewed,　especially　the　research　progress　in　the　last　decade　by　the　State　Key　Laboratory　of　Multiphase　Flow　in　Power　Engineering,　Xi’an　Jiaotong　University.　In　terms　of　strengthening　the　gasification　process　of　coal　in　supercritical　water,　it　was　revealed　that　the　ring-opening　reaction　of　polycyclic　aromatic　hydrocarbon　is　the　rate-limiting　step　of　coal　gasification.　The　gasification　model　of　porous　coke　particles　in　supercritical　water　was　established　and　the　gasification　mechanism　was　obtained.　The　gasification　rate　of　coal　was　increased　by　about　17%　by　circulating　the　fluid　with　high　free　radical　concentration.　The　low-temperature　and　low-velocity　side　reaction　zone　was　reduced　by　adjusting　the　nozzle　jet　angle.　In-situ　coupling　matching　of　endothermic-exothermic　reactions　was　achieved　by　adding　catalysts.　In　terms　of　multiphase　flow　and　heat　transfer　in　a　supercritical　water　fluidized　bed,　a　new　energy　minimum　multi-scale　(EMMS)　drag　model　was　proposed　based　on　the　experimental　results　of　flow　characteristics　of　mesoscale　structures.　The　characteristics　of　fluidized　bed　internal　flow　pattern　evolution　and　the　corresponding　calculation　criteria　were　obtained　based　on　the　pressure　difference　experimental　data.　The　dynamic　characteristics　of　bubbles　in　the　fluidized　bed　were　revealed　and　the　calculation　criteria　of　bubble　chord　length　and　rising　velocity　were　presented.　The　bed-wall　heat　transfer　correlation　and　the　heat　transfer　model　based　on　the　particle　renewal　theory　in　the　homogeneous　expansion　were　established.　In　terms　of　kinetics　of　hydrogen　oxidation　in　supercritical　water,　the　reaction　pathways　and　kinetic　parameters　of　hydrogen　oxidation　were　obtained　from　the　atomic　level　sing　the　reactive　force　field　(ReaxFF)　method.　The　global　reaction　rate　expression　of　hydrogen　oxidation　was　established　based　on　the　experimental　data.　An　elementary　model　of　hydrogen　oxidation　in　supercritical　water　was　established,　and　the　reaction　path　analysis　and　sensitivity　analysis　were　conducted.　The　above　research　results　provide　a　guidance　for　the　regulation　and　strengthening　of　supercritical　water　coal　gasification　reaction,　and　the　design　of　gasification　reactor　and　oxidation　reactor.　©　2022　China　Coal　Society.　All　rights　reserved.