Since the discovery of high Tc superconductivity in La-Ba-Cu-O system,great progress of research on high Tc superconductivity in oxides have beenmade. Up to now, almost all rare earth elements Lave been substitutedsystems except Ba-(Ce, Pr, Tb)-Cu-O are found to be superconductors whichunually have much higher Tc than in La-Ba-Cu-O. Many experimental results Since the discovery of high Tc superconductivity in La-Ba-Cu-O system, great progress of research on high Tc superconductivity in oxides have been made. Up to now, almost all rare earth elements Lave been substituted systems except except Ba- (Ce, Pr, Tb) -Cu-O are found to be superconductors whichunually have much higher Tc than in La-Ba-Cu-O. Many experimental results