Designed by Adalbert Niklewicz, it is a normal side platform station, built in open cut due to the presence of weak Utica shale in the surrounding rock.

Its entrance is located near a series of tunnels that cross the Autoroute Ville-Marie, giving access to Old Montreal.

[5] The $12m project also involved the renovation of the main entrance building (including installation of a new green roof) and underground city access to Centre hospitalier de l'Université de Montréal (CHUM).

[5] One of the most important artworks in the Metro, a set of stained glass windows by noted Quebec artist Marcelle Ferron, illuminates the mezzanine of this station.

This station is named for Champ-de-Mars, a public park facing Montreal City Hall.