Heavy　liquid　metals　such　as　sodium　and　liquid　lead-bismuth　eutectic　(LBE)　have　excellent　heat　transfer　capa-bility　and　receive　increasing　attention　as　the　primary　coolant　in　fast　reactors　and　accelerator　driven　systems　(ADS).　In　ADS　system,　coolant　system　is　designed　as　natural　circulation,　to　simplify　the　primary　system,　improve　the　compactness　of　reactors　and　most　important　of　all　is　to　increase　the　inherent　safety　of　reactor.　Because　the　electromagnetic　pump　that　drives　the　flow　of　liquid　metal　is　eliminated　in　the　coolant　natural　circulation　system.　In　such　situation,　gas-lift　technique　named　gas-lift　pump　could　be　adopted　to　enhance　the　coolant　natural　cir-culation　capacity.　The　open　research　on　the　performance　of　gas-lift　liquid　metal　pump　is　much　less　than　that　of　air-lift　water　pump.　The　physical　properties　of　large　density　ratio　of　liquid　to　gas,　small　kinematic　viscosity　and　high　surface　tension　of　liquid　metal　is　believed　to　have　effects　on　the　performance　of　gas-lift　liquid　metal　pump.　The　present　paper　carries　out　some　preliminary　numerical　simulation　work　on　the　two-phase　flow　characteristics　of　argon-liquid　LBE　in　the　up-riser　tube　and　the　performance　of　gas-lift　liquid　metal　pump.　Eulerian-Eulerian　two-fluid　model　is　used　to　describe　the　two-phase　flow.　Some　interphase　momentum　transfer　models　from　literature　are　used　to　account　for　the　interfacial　momentum　transfer　between　liquid　and　gas　phases.　SST　k-omega　model　with　mixture　treatment　is　used　to　compute　the　turbulence　parameters　of　the　homogeneous　mixing　phase　in　the　present　study.　The　influence　of　such　parameters　as　argon　injection　superficial　velocity,　submergence　ratio　and　diameter　of　up-riser　tube　on　the　discharged　LBE　mass　flow　rate　and　pressure　drop　of　gas-lift　pump　are　checked.　The　results　could　be　helpful　for　the　design　of　the　gas-lift　liquid　metal　pump.