Abstract: The healthy lifestyle plays a major role in preventing of chronic and incommunicable diseases. On one hand a sedentary lifestyle due to available life welfare equipments and media and the other hand use of fatty and high calorie foods have changed the lifestyle. The aim of this study is, survey of lifestyle and compare it between girl and boy students resident in dormitories of Tehran University of Medical Sciences (TUMS). The aim of this study is, survey of lifestyle and compare it between girl and boy students resident in dormitories of Tehran University of Medical Sciences (TUMS). This is a cross sectional study carried out on 600 students of dormitory that selected randomly. The results of this survey reveals that the lifestyles of 44.8% students both girls and boys undesirable. This figure in boys and girls is 69.5-38.5%, respectively. Significant relation between lifestyle variable such as diet and coping with stress, physical activity and coping with stress was found. In order to help students to change in their lifestyle and reaching to optimum level; they should be encouraged to do physical exercise, to eat healthy and nourished food and to cope with stress.