Abstract: Natural mutations in Mt. Namjagbarwa Region take place extremely and frequently. Natural disasters such as earthquakes, debris, collapses and landslides, avalanches and floods are existed everywhere. Their characteristics, regulars and causes of formation as well as their social and economic affects were observed. The sequences suggested that the disasters can be characterized of chained, grouping, repeated and abrupt features. The main natural causes of their formation are intense Neotectonic movement, hilly and abysmal topography, sultry and rainy climate. They do harm to the people and their property,communications and transportation,montane agriculture and forest reserves.