The　compound　system　of　ordinary　Portland　cement　and　sulpho-aluminate　cement　shows　some　special　properties　which　are　imperative　for　rush　repair　work.　The　setting　time　of　the　compound　system　is　adjustable　from　10　minutes　to　hours　by　the　combined　use　of　accelerator　and　retarder　simultaneously,　and　the　time　between　initial　and　final　setting　is　very　short.　The　strength　develops　rapidly　after　setting,　compressive　strength　at　30　minutes　can　reach　as　high　as　8-10　MPa.　The　final　strength　at　28　days　is　over　50　MPa,　and　continue　develops　afterwards.　The　influences　of　temperature,　water　solid　ratio　and　other　chemical　admixtures　on　the　properties　the　compound　cementitious　material　was　also　examined　and　discussed.　The　strength　and　free　expansion　rate　of　concrete　made　of　the　cementitious　material　were　measured.　The　mortar　made　from　the　cementitious　material　showed　good　corrosion　resistance　to　erosive　solution　and　good　frost　resistance.　By　means　of　XRD　analysis　and　porosity　measurement,　the　mechanism　of　high　early　strength　was　discussed.　The　compound　cementitious　material　has　been　used　in　several　rush　repair　engineering.