People in Belgium want to simplify the electoral laws. The responsible department (Ministère de l'Intérieur) has a project which is presented as being neutral, having no political implications. The authors compare the results of the last elections (March 74) computed according to several systems, including the new project. Their conclusion is that the new project is politically oriented: it favours the big parties.The authors propose a new system of ballot which is really neutral, and they show it by a simulation on the results of the elections since 1954.Their system is simple and easily treated by computer.