To　the　flow　and　heat　transfer　characteristics　in　near　wall　region　for　jet　flow　with　different　injection　angle　in　the　reactor　coolant　system,　based　on　the　test　results,　the　flow　characteristics　and　mixing　function　and　non-dimensional　heat　transfer　coefficient　in　different　regions　of　T　junction　components　with　45°　and　90°　injection　angle　were　compared　and　analyzed　at　the　velocity　ratio　range　from　0　to　2.　The　research　results　indicated　that　the　effect　of　the　injection　angle　on　the　change　trend　of　the　mixing　function　and　non-dimensional　heat　transfer　coefficient　is　small,　and　the　key　parameter　determining　the　change　trend　is　still　the　velocity　ratio.　The　effect　of　the　injection　angle　is　only　on　the　values　of　the　mixing　function　and　non-dimensional　heat　transfer　coefficient.