In the world, more than 90% of goods are transported through sea by ships and the estimated share of Iran in transporting goods by sea is more than 94%. The mass good transportation on one hand, and the cheapness of marine transportation on the other hand, resulted in importance of marine transport. every year various marine causalities occur in effect of negligence and carelessness of human elements which are due to fatigue, restlessness (sleeplessness), poor ship design, poor ship management, lack of sufficient training, and etc. other than loss of life and property, these casualties threaten the environment. The present research analyses and investigates the role of human element in marine accidents.