Superconductivity is one of the exotic phenomena observed in the some solids not in the liquids and gasses. When a superconductor is cooled below a certain temperature, the electrical resistivity of the material goes to zero abruptly at certain critical temperature Tc . This new state is the characteristic of the material. Above this critical temperature the material is in the normal state, but below this temperature it enters into an entirely new state called superconducting state. The temperature at which the material enters from the normal state to the superconducting state is known as critical temperature of superconductivity. In this book the method of preparation and superconducting properties of Cu1-x TlxBa2CaCu2O8-y thin films and bulk samples are discussed.