Series　of　rod　samples　of　Zr55Al10Ni5Cu30　alloy　were　prepared　by　magnetic　suspend　melting　and　copper　mold　suction　casting　method.　The　effect　of　thermal　rate　treatment　(TRT)　process　on　glass　forming　ability　(GFA),　mechanical　properties　and　microstructure　of　Zr-based　bulk　metallic　glass;　were　investigated.　It　shows　that　GAF,　mechanical　properties　and　microstructure　of　as-cast　Zr55Al10Ni5Cu30　BMGs　alloy　to　large　extent　is　related　to　TRT　process.　GFA　and　thermal　stability　of　as-cast　Zr55Al10Ni5Cu30　alloy　increase　when　overheating　temperature　increases.　Supercooled　liquid　region　Delta　T(x)　and　parameter　gamma　increase　from　73　K　to　89　K,　from　0.413　to　0.417,　respectively,　when　casting　voltage　increases　from　7　kV　to　10　kV.　And　a　threshold　overheating　temperature　is　found　for　the　fully　amorphous　structure,　below　which　it　may　have　an　intersection　with　the　crystallization　position.　It　is　found　that　the　compressive　strength　increases　and　the　compressive　plasticity　slightly　decreases　when　overheating　temperature　increases.　However,　the　compressive　strength　and　the　compressive　plasticity　simultaneously　increase　to　1.91　MPa　and　2%　when　casting　voltage　increases　to　10　kV.