these last ten years, the educational systems of the provinces in canada knew several important changes in their mode of regulation which have effects on the conditions and the content of the work of the school actors. our article intends studying their effects on the work of the principals of schools: how do they feel the recent school evolutions? how do they live, do they conceive and do they exercise their work today? we shall try to answer these questions on base of the results of a survey by questionnaire realized in 2005 with 2144 principals of elementary and secondary schools in the whole of canada. the survey shows that most of the principals have a qualified vision of the impacts of the school evolutions, that their work implies on the exercise of a multitude of responsibilities and that it appears to bring them a professional satisfaction under numerous aspects.