The landslides and avalanches formations represent serious danger on the constructions. They interfere with Tectonic conditions to constitute a constructive system in some cases. Therefore appear the importance of this study, which focused on the tectonic role of these phenomenon in Al Bassit area, NW. Syria, where different deposits, mostly volcano- sedimentary of Ophiolitic complex. The field executed studies and their analysis have permit to determine the lithological and tectonic factors which have affecting the region. Also the study of slope slip and characterizations have been studied and an important comparative tables are proposed to study globally and locally these landslides, and serve as a model for future studies to prevent the risks of these slips.