To　provide　a　theoretical　basis　for　the　selection　of　counter-flow　thrust　vectoring　nozzle　geometry,　numerical　simulation　method　was　applied　to　study　the　internal　flow　structure　and　performance　of　the　counter-flow　thrust　vectoring　nozzle　with　suction　angle,　suction　collar　horizontal　height　and　vertical　height　in　zero　attack　angle　and　subsonic　conditions.　The　changes　of　thrust　vector　angle,　resultant　thrust　ratio,　and　secondary　mass　flow　ratio　were　obtained.　Research　results　indicate　that　both　suction　angle　and　collar　vertical　height　have　less　effects　on　the　change　of　the　counter-flow　vectored　nozzle　thrust　vector　angle.　And　when　suction　angle　and　collar　vertical　height　changes　respectively,　the　angular　deviation　between　their　maximum　and　minimum　vector　angle　is　not　more　than　0.35°.　Resultant　thrust　ratio　decreases　with　the　increasing　of　suction　angle　and　collar　vertical　height.　When　suction　angle　changes,　resultant　thrust　ratio　is　about　0.778　and　the　change　value　is　not　more　than　0.001.　Resultant　thrust　ratio　is　in　the　range　from　0.77　to　0.84　as　vertical　height　changes.　Mass　flow　ratio　is　less　affected　by　suction　angle　and　collar　vertical　height.　Jet　attachment　easily　occurs　when　horizontal　height　is　too　small.　With　increasing　of　horizontal　height,　thrust　vector　angle　increases,　and　it　can　achieve　the　maximum　value　7°.　On　the　contrary,　resultant　thrust　ratio　decreases　and　it　is　in　the　range　of　0.75~0.87.　During　the　procedure　of　increasing　horizontal　height,　suction　flow　shifts　up　to　2%　from　co-flow　to　counter-flow　and　mass　flow　ratio　increases.　The　overall　performance　of　thrust　vectoring　nozzle　significantly　decreases　compared　with　no　outflow.