In São Paulo's State, in a systematic way, a few instruments of Environmental Planning in its Protect Areas, have been produced. Between 1996 and 1997 Masters Plans were elaborated for ten Protect Areas, through the "Projeto de Preservaçao da Mata Atlântica" (Atlantic Rain Forest Preservation Project), in the Coastal Province of the State. Such plans were elaborated being followed an unpublished methodology in São Paulo. The objective of this paper is to present the referring results of the researcher's contribution and risings in Geomorphology, while science that supplied important parameters for the elaboration of these plans, returned to the environmental management. The geomorphologic research was elaborated through of two levels of information:

1) the classification of the morphologic features diversity and associated morphodinamics processes;
2) the identification, starting from an analysis integrated with biological and socioeconomic factors, of the potentiality of habitats and occupation risk areas, for example, the subject ones the landslides and the susceptible to the overflow, typical processes of the slopes in the Serra do Mar.

The results already allowed a refinement of the proposals of Environmental Zoning existent for these areas, facilitating a rearrange of the inadequate land-use and adapting them to the support capacity of the environment, as well identifying the conflicts with the established environmental legislation. The vectors of human pressure were also appraised with relationship to the risk to the ecotonals areas, in places where the characteristics of the environment facilitated the regeneration of the significant vegetable covering, but that met under a degradation human use. This way, the Geomorphology's role is confirmed as fundamental science in applied works, as those that objectify to identify potentials and risks to the occupation in areas of complex compartimentation of the relief, as in the case here exposed.