In this paper,the Polar Mesosphere Summer Echoes(PMSE) are studied with observations of a Digisonde Portable Spunder-4(DPS-4) at Zhongshan Station,Antarctica.It is confirmed that the phenomenon of the PMSE-Es can be identified at MF and HF bands by analyzing the ionospheric E and Es layer's irregular characteristics.There are similarities between Arctic PMSE and Antarctic PMSE-Es in variations of the occurrence rate,such as seasonal variation,diurnal variation and semidiurnal variation,although some discrep...