The aim of this research is establishing healthy, safety and environment management system in construction phase of a dam in Northern Zagros zone. Methods are based on three steps. The first step is risk factor identification. In this step, it has been studied which risks are caused by activities in operation phase in the three group of physical-chemical risk, biological risk and human risk. The second step is risk assessment. The risks are introduced in three criteria, severity, probability and vulnerability, and the environmental risk parameters have been scored by using expert opinion. The risks were prioritized by using Entropy method and TOPSIS Solver 2014 software. The results have shown that in the construction phase, reduction of aquatic life, destruction of vegetation and workers fall are of high risk. Moreover, in the third step the Healthy, Safety and Environment Managment System (HSE-MS) program is proposed in five steps. The first step is policy and objective. The second step is offering environment, health and safety plan. The third step is program implementation. The fourth step is monitoring and control on program, quality air, sewage and residue. The fifth step is reviewing the program implementation problem changing the monitoring plan.