This article gives an account of the belgian party system in 1974. It concludes at the existence of a «multipartist» system. It also examines the ideological character of the party system. For this purpose, it studies the electoral platforms of all the parties. From a semiotics viewpoint, it isolates a number of semantic axes. After a binary coding, it factor-analyses the results. Two main factors are extracted «ideological mixing» and conservative - progressist position.