This　paper　presents　a　gas-liquid　two-phase　flow　measurement　method　by　sampling　a　very　small　fraction　(5%)　of　the　total　flow.　Unlike　the　conventional　sample　technique,　the　sample　is　drawn　from　the　whole　cross　section　instead　of　a　local　place.　During　the　sampling,　a　discrete　total　two-phase　flow　sample　is　extracted　by　a　sampling　device　and　separated　into　single　phase　flows　with　a　much　small　separator,　and　they　are　subsequently　metered　by　two　single　phase　flowmeters　respectively,　after　that,　these　two　streams　will　return　to　the　main　stream.　The　sample　is　able　to　represent　the　total　flow　and　accurately　determine　the　total　flowrates.　Because　the　sample　is　only　a　very　small　fraction　of　the　total　flow,　the　separator　can　be　greatly　reduced　in　size,　which　can　be　as　small　as　a　single　phase　flowmeter.　At　the　same　time,　considering　the　flow　has　become　two　single　phase　streams　after　the　separation,　the　measurement　reliability　is　significantly　improved.　Experiments　were　conducted　in　an　air-water　two　phase　flow　test　loop.　The　inner　pipe　diameter　of　the　test　loop　was　50　mm,　and　the　superficial　gas　velocity　varied　from　1.5　m/s　to　22　m/s,　the　liquid　superficial　velocity　was　in　the　range　of　0.02-0.45　m/s.　The　flow　pattern　occurring　during　the　experiments　included　stratified　flow,　stratified　wave,　slug　flow　and　annular　flow.　The　experimental　results　showed　that　this　sampling　method　was　feasible　of　measuring　the　two　phase　flowrates,　and　independent　of　flow　pattern,　the　error　of　flowrates　measurements　was　less　than　+/-　5%.　(C)　2011　Elsevier　Ltd.　All　rights　reserved.