To　investigate　the　effects　of　plume　interaction　caused　by　multiple　spacecraft　engines　on　the　flow　field　structure　and　parameters,　the　pressure　fields　of　single　plume　and　dual　plumes　generated　by　hydrogen/oxygen　engines　with　60　N　thrust　were　determined　using　a　pitot　tube　array　in　vacuum　plume　effect　experimental　system　(PES)　of　Beihang　University.　The　experimental　results　show　that　the　pressure　in　the　single　plume　field　decreases　rapidly　with　the　increase　of　axial　distance,　and　the　location　of　the　maximum　pressure　along　the　same　axial　distance　gradually　deviates　from　the　nozzle　axis　due　to　the　compression　waves　generated　from　the　bell　nozzle.　Plume　interaction　occurs　in　the　region　between　the　dual　prime　plumes,　whose　action　range　and　intensity　increase　with　the　increase　of　axial　distance.　To　the　highest　degree,　the　pressure　of　the　interacted　plume　can　be　more　than　5　times　that　of　the　single　plume　at　the　same　point.　The　location　of　the　maximum　pressure　along　the　same　axial　distance　gradually　deviates　from　the　symmetry　plane　of　the　dual　engines　due　to　the　compression　waves＇　boundary　of　the　interacted　plume.　©　2019,　Editorial　Board　of　JBUAA.　All　right　reserved.