Superconducting glass ceramics of Bi0.8Pb0.2SrCaCu1.5Oy(sample A) and BiPb0.2SrCaCu1.5Oy(sample B) have been prepared by using the melt quenching method. It was found that the volume fraction of the highTcphases in sample A annealed at 830 or 840 °C for 250 h was much higher than that in sample B. The annealed (840 °C, 250 h) sample A exhibited superconductivity with aTc(zero) of 100 K and a critical current density (77 K, zero magnetic field) of 120 A/cm2.