The morphology of the celtic and gallo-roman farms, stays a repetitive element with a low variability in the “haut-normand” landscapes. The comparison of the archaeological information of some sites, according to a wider study of their environments, allows to approach the way the farmers tend to run the development of their raw material, meaning the soil conditions. Associating a khnowledge of the topography with a will to reproduce the land exploitation modes inherited from past, opportunism and determinism are combined by the farmers in a management of the ground which stays difficult to assess. The notions of land exploitation, management of the soil and evolution of the celtic agrarian practices during the Antiquity period remain still practically unkhnown in our regions. Some reflexions could be proposed and suggest new developments of the research.