Background and aim: Many people sustain injuries in Chahar Shanbeh Soori ceremony that is held at the final hours of the last Tuesday of every year. This study aimed to identify epidemiology of injuries that caused in this ceremony in 2009.Materials and Methods: At this epidemical descriptive study, data and specifications of people, injured in Chahar Shanbeh Soori ceremony, were collected by universities of medical sciences using standard and specified questionnaires and then sent to Preventive of Accident and Emergency Medicine Department to be evaluated. Demographic and epidemic information, as epidemic areas, states, type of explosive materials and jobs of injured people were studied. At the end, data were compared with information of a few years ago.Results: On the whole, 1817 people were injured in this ceremony (%83.2 male and 16.8 female), and average age of them was 20.9±10 years old. Subgroup of 15-24 years old, are the most injured people and the most injuries, were caused by inflammable materials. More than one third of injuries of organs are related to hands (%34.4). %81.4 of injured people, were outpatients, and the rest were hospitalized.Conclusion: as the most group of injured people, were students injured during game with inflammable materials, warning programs, should presented to parents via media and schools.