In　order　to　find　the　effects　of　different　Ma　of　the　external　flow　on　the　performance　and　structure　of　internal　flow　field　of　counterflow　thrust　vectoring　nozzle,　referring　to　the　experiment,　numerical　simulation　was　applied　to　study　the　flow　field,　vectoring　angle　and　mass　flux　ratio　of　secondary　flow　under　different　Ma(0~1.5).　The　results　show　that,　as　the　Ma　increases　from　0　to　0.8,　the　flow　filed　in　the　nozzle　changes　so　as　to　change　the　difference　of　pressure　across　the　primary　flow,　resulting　in　the　vectoring　angle　decrease,　and　the　mass　flux　ratio　of　secondary　flow　will　increase　quickly.　As　the　Ma　increases　from　0.8　to　1.5,　both　the　flow　filed　and　the　vectoring　angle　have　no　change,　and　the　mass　flux　ratio　of　secondary　flow　will　increase　slowly.