Overheating　has　a　pronounced　effect　on　the　thermal　stability　and　mechanical　properties　of　Cu36Zr48Ag8Al8　bulk　metallic　glass.　Higher　overheated　temperature　can　enhance　the　thermal　stability　of　bulk　amorphous　alloys,　corresponding　to　higher　specific-heat　capacity　and　smaller　initial　defect　concentration.　Bulk　amorphous　alloys　exhibit　good　compressive　plasticity　at　small　overheated　levels,　whereas　the　compressive　fracture　strength　and　microhardness　show　a　significant　increase　followed　by　a　slight　decrease.　The　mechanical　properties　of　bulk　metallic　glasses　fabricated　by　different　casting　process　are　influenced　by　the　interaction　of　the　free　volume　and　residual　stresses.