Supercritical　water　fluidized　bed　is　a　novel　efficient　gasification　reactor,　its　flow　characteristics　is　diverse　from　that　of　traditional　gas-solid　fluidized　bed.　The　contrast　of　flow　characteristics　is　made　between　supercritical　water　fluidized　bed　and　traditional　gas-solid　fluidized　bed　with　the　model　which　is　developed　based　on　DEM-CFD　coupled　method.　According　to　the　simulation,　we　can　get　following　result:　traditional　gas-solid　fluidized　bed　translate　to　the　bubbling　fluidized　state　when　the　inlet　superficial　gas　velocity　is　just　above　minimum　fluidization　velocity,　while　supercritical　water　fluidized　bed　experiences　a　period　of　uniform　expansion　after　the　superficial　gas　velocity　exceeds　the　minimum　fluidization　velocity,　then　it　reaches　the　bubbling　fluidized　state;　bed　pressure　drop　fluctuations　of　supercritical　water　fluidized　bed　is　less　than　that　of　traditional　gas-solid　fluidized　bed;　supercritical　water　fluidized　bed　has　a　higher　bed　expansion　height　under　the　conditions　of　the　same　fluidization　number　(u/umf);　In　the　bubbling　fluidized　state,　the　bubble　diameter　increase　with　the　rise　of　the　bed　height　in　both　of　the　fluidized　bed;　the　average　equivalent　bubble　diameter　of　supercritical　water　fluidized　bed　is　less　than　that　of　the　traditional　fluidized　bed　under　the　conditions　of　the　same　fluidization　number.