In　this　paper,　we　calculated　the　roughness　of　the　basal　boundary　collected　at　Princess　Elizabeth　Land　(PEL)　to　evaluate　the　topographic　structure　via　the　ice-sounding　data　collected　during　32nd　and　33rd　Chinese　Antarctic　Research　Expeditions　(CHINARE　32　and　33).　The　calculation　is　achieved　by　a　two-parameter　roughness　index　method,　which　could　differentiate　different　classes　of　subglacial　landscape,　in　particular　between　erosional　and　depositional　settings.　Finally,　the　calculation　results　of　partial　regions　of　PEL　are　illustrated　to　describe　the　roughness　of　the　detected　regions.　©　2020　The　Authors,　published　by　EDP　Sciences.