Disaster that is extreme events occured beyond human control caused physical, economic, social disruptions. It can be divided into three categories as natural, man-made and technological hazards according the cause. Terrorism and wars are also important disasters especially in Turkey. Disasters can cause mass casualty injuries (MCI) and multiple traumas. In case of MCI, because of a great number of injured people; hospital bed, surge and intensive care unit capacities may be insuffient. Successful and effective management of disasters requires pre-established systematic plans to minimize the damage and control the situation. It is important to identify and prioritize who requires an urgent intervention in a short time. Therefore, several reforms in the health care strategies in disaster scene have been occured from the past to the present. Hereby, the term `triage` a process of recognize the urgency among patients, has began to use in medicine. Triage is originated the French word trier, meaning to seperate, put in order, classify and has been started to use in military medicine. It was performed firstly during the Franco-Russian in the reign of Napoleon Bonaparte. Although, triage has been evolved over time, there is still no gold standard triage classification for using for MCI. So, each emergency team in disaster scene or hospitals have own sustainable, practical triage model. Disaster triage is a whole that should be applied at all levels and also triage should be taught to all healthcare personnel. In addition, it is critical to take precautions in order to minimize the loss of life and property when a disaster occurs.