Steam　ejectors　are　regarded　as　a　promising　energy-saving　technology,　it　is　thus　crucial　to　enhance　its　working　performance　for　broader　application　horizons.　In　this　study,　a　detailed　simulation　is　made　of　a　design　steam　ejector　used　in　MED-TVC　desalination　system.　The　results　discloses　that　there　is　actually　a　large　entrained　flow　blocked　region　downstream　the　entraining　entrance　and　significant　low-pressure　potentials　inside　the　throat　and　diffuser　whose　pressure　are　far　lower　than　that　of　the　blocked　region.　Based　on　this　finding,　a　so-called　pressure　regulation　technology　is　proposed　to　use　these　existing　pressure　differences　to　dredge　the　blocked　entrained　flow,　and　thus　more　entrained　steam　could　be　drawn　into　the　ejector.　Then　the　feasibility　verifications　of　different　pressure　regulation　schemes　are　carried　out,　and　a　systematic　analysis　and　investigation　of　their　influences　on　the　entrainment　performance　has　been　implemented　systematically　from　the　mass　flow　rate　and　pressure　field.　The　results　reveal　that　there　is　an　optimum　combination　of　pressure　regulation　schemes　to　dredge　the　blocked　entrained　flow　effectively,　by　which　a　maximum　and　considerable　entrainment　ratio　improvement　could　be　achieved,　as　large　as　26.85%　in　the　covered　simulations,　and　with　3.31%　even　under　the　design　condition.　To　be　specific,　the　throat-entraining　entrance　downstream　pressure　regulation　should　be　adopted　if　the　ejector　operates　under　the　design　condition,　otherwise,　the　combined-entraining　entrance　downstream　pressure　regulation　is　the　best　choice.