GeSbTe is the most suitable media for PCE (phase change erasable optical disc) at present. By using the PCE dynamic testing equipment, experimental study on dynamic overwriting characteristics of the GeSbTe PCE discs made by our institute is conducted. The results show that it could be direct overwrited for several times, and better erasing effect with much more overwrite times could be achieved when pulse erasing method was used instead of continuous erasing method.