At　present,　Rapid　IO　has　been　widely　used　in　embedded　platforms　due　to　its　high　transmission　efficiency　and　low　transmission　delay,　making　the　software　of　the　embedded　platform　a　new　speed.　Windows　system　has　the　advantages　of　friendly　interface,　wide　user　base,　easy　maintenance　and　upgrade,　etc.,　which　has　received　extensive　attention　in　the　industry,　but　the　real-time　performance　is　poor　and　it　is　impossible　to　directly　communicate　with　the　embedded　processor　directly　through　Rapid　IO,　which　makes　it　impossible　to　become　a　semi-physical　simulation　system.　Therefore,　the　TSI721　driver　development　based　on　the　RTX　environment　is　designed.　The　internal　structure　of　Rapid　IO　protocol,　RTX　real-time　subsystem　and　Tsi721　switch　chip　is　briefly　described.　Detailed　description　of　the　development　framework　and　interface　design　of　the　Tsi721Pcie　driver,　the　main　process　of　RTX　driver　development.　Experiments　verify　that　PCIe　and　RTX　drivers　are　stable,　reliable,　and　capable　of　completing　tasks　in　real　time.　©　2019　Association　for　Computing　Machinery.