The　streamwise　and　the　spanwise　velocity　time　series　are　measured　from　the　wall　to　the　centre　of　the　cross　duct　for　the　flow　in　a　rectangular　T-junction　duct,　which　is　similar　to　airflow　conditions　of　high-speed　train　ventilation　system.　The　turbulent　statistical　properties　are　reported　at　three　streamwise　locations　which　correspond　to　the　upstream/downstream　and　the　centreline　of　the　T-junction　(x/D=+/-　1　and　0,　respectively).　Turbulence　intensities,　skewness　and　flatness　factor,　as　well　as　probability　density　functions,　have　been　investigated　at　the　range　of　Re=5400-8700.　Furthermore,　the　multiscale　properties　of　the　flatness　factor　are　analysed　by　using　orthogonal　wavelet　transform.　It　is　found　that　the　turbulent　intensities　remain　a　constant　in　the　centre　region　for　three　streamwise　locations　while　they　are　weakened　in　the　turbulent　boundary　layer　at　x/D=1　by　effect　of　suction.　The　location　of　the　strongest　intermittency　is　located　at　y/h=0.56　for　x/D=-1　and　0.　While　at　downstream　of　T-junction　(x/D=1),　the　location　of　the　strongest　intermittency　shifts　down　to　y/h=0.28.　Also,　the　wavelet　flatness　factor　is　more　clearly　distinguished　the　intermittency　of　the　small-scale　turbulent　structure　compared　with　the　conventional　flatness　factor　and,　the　obtained　experimental　data　are　fitted　and　used　to　predict　the　mean　streamwise　velocity　profiles.