Mass motion is the world problem and is the most common type of natural phenomena of forming surface of land so that it has been occurred in all geology era. In Iran, due to geographical situation and different climatic variety was always problematic and have had abundant physical and financial injuries. Two thousand (Duhezar) with 3.8175 kilometers big in southern of Tonekabon. Investigation conducted in that studying area is one of mass motion of sliding has been researched. The level of that recycling has been occurred was 270 meters and 20 meter wide. The research aims to study most effective factors on sliding and preventing from damages compromising that of Duhezar area and method of research is measuring and using field studies upon air pictures and satellite and topographical maps and geological maps. The results of the study show that a number of factors including: slippery, sensitive clay minerals, stone aerospace, destroying vegetation coverage. Slippery imminent incident has been increased and factors such as water, and earthquake caused creating slippery of earth in an area of study.