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Advanced projects envisage multiple EVAs on the planetary surface and great distances to be covered by EVA astronauts during manned Mars missions. Astronauts' egress with special Martian EVA space suits on can be provided only through the landing module/spacecraft airlock. To move over the planet, astronauts are expected both to walk and use a planetary rover (Martian rover). To make EVA activities on the planetary surface successful, an optimized concept for space suit attachment both to the airlock and Martian rover should be developed. The paper considers concept options of the planetary space suit (PSS)/airlock and PSS/Martian rover mechanical interfaces based on patent information study and analysis of development, test and operation data for the EVA space suits.