Since Michel et al.discoveredsuperconductivity of the BiSrCuO system at20K,the work of synthesizing highT_c superconductors without rare-earth byadding some elements other than rare-earthsin the BiSrCuO system have made a lot ofprogress.Maeda et al.have developedBiSrCaCuO superconductor with T_c of 120Kby adding Ca into the BiSrCuO system.ThenSunshine et al.and He Qing et al.havesynthesized BiPbSrCaCuO superconductors Since Michel et al., Discovered superconductivity of the BiSrCuO system at20K, the work of synthesizing high T_c superconductors without rare-earth byadding some elements other than rare-earthsin the BiSrCuO system have made a lot of progress. Maeda et al., Developed BiSiCaCa superconductor with T_c of 120Kby adding Ca into the BiSrCuO system. Sunshine et al. and He Qing et al. hepatically incorporated BiPbSrCaCuO superconductors