The　pressurization　property　of　the　three-stage　centrifugal　multiphase　pump　under　the　condition　of　water　and　air-water　two-phase　flow　was　studied　experimentally.　For　single-phase　water,　the　pressurization　performance　agrees　well　with　the　designed　values.　The　two-phase　pressurization　performance　presents　different　stages　as　a　result　of　gas　entrainment.　At　three　rotational　speeds　(3500,　4000,　4500　r•min-1),　the　gas　flow　rate　was　maintained　constant.　With　the　decrease　of　liquid　flow　rate,　the　two-phase　pressurization　gradually　deviates　from　the　single　phase.　With　the　increase　of　gas　volume　fraction,　the　two-phase　pressurization　can　be　divided　into　three　regions:　discrete　bubble　region,　bubbly　flow　region　and　long-bubble　region　at　constant　liquid　flow　rate.　The　two-phase　pressurization　is　mainly　dependent　on　the　rotational　speed　and　gas　volume　fraction,　and　independent　with　liquid　flow　rate　for　the　liquid　flow　rate　range　10　~26　m3　•h-1.　The　equivalent　flow　rate　and　head　on　gas-liquid　two-phase　condition　were　defined.　Under　single-phase　and　two-phase　conditions,　the　pumps　meet　the　affinity　law　well,　which　provides　a　reference　for　relevant　design.　©　2021,　Science　Press.　All　right　reserved.