Glass-ceramic containing barium-mica in the systerm Ba(0.5)Mg3(Si3AlO(10))F2 Mg2Al4Si5O(18)Ca3(PO4)2 show high mechanical strength and good machinability,σb=229 MPa,K(IC)=2.48MPa.m(1/2),drilling speed>7mm/min. Such good properties are attributable to the controlledmicrostructure of the barium-mica-containing glass-ceramics,i.e.inter locking mica crystalsand″cabbage-head″feature,Two kinds of typical fracture pattern were observed,i.e.layerlacks pattern and cleavage pattern.