The terrestrial Gastropod Molluscs of the National Center of Floristic (NCF) were studied in this work through their relative abundance, their frequency of occurrence as well as their density of population. To do this, quadras were delineated on the different parcels of the NCF and a stratified sampling was applied. Two sampling methods, namely the direct collection method and the litter sampling method, were used for the collection of specimens. The individuals collected were identified and counted. A total of 4,216 specimens of terrestrial Gastropod Molluscs were collected. Achatinidae and Subulinidae are numerically the most abundant with 54.06% and 42.08% respectively of the molluscs harvested. Only species of the family Achatinidae have a frequency of occurrence greater than 50% so can be considered constant. In terms of stand density, it is very high for micro-species and low for Achatinidae (large species). Achatinidae are mostly found in the arboretum while micro-species are mainly concentrated in fallow. In addition, NCF molluscs are characterized by either high abundance or regular distribution. In addition, of the three microhabitats used, the habitat who includes the soil surface, below the litter, on the litter and under the trunks of trees lying on the ground is the most inhabited by the molluscs of the NCF.