IntroductionSome urban spaces, due to their structural and social features, create situations in which criminals are encouraged to commit crimes. Although in these spaces, the rate of crimes may be low, these spaces induce the sense of defenseless to citizens and give rise to the sense of unsafety and fear among people. As a result, the use of such spaces decrease gradually and their emptiness results in the situations that are proper for committing crimes. This fact is more probable in central and worn areas due to the dominant physical and social conditions in these areas. These areas are known as “ defenseless spaces” , which are prone to crimes more than other urban spaces. Factors such as the emptiness of the environment, chaos, and weariness lead to the creation of such unsafe spaces. On the other word, these are spaces that do not have any positive effects on the surrounding environment as well as the people who use them. Urban defenseless spaces are areas that according to their physical properties, they are more suitable spaces for committing crimes relative to other urban areas. These spaces often do not belong to any body and even if they have proprietress, they are abandoned. Urban defenseless spaces are so important in urban studies due to their numerous effects on the urban lives especially their effect on the creation of fear and unsafety. So, performing systematic research in this field develops new insights. Harandi neighborhood in the central area of Tehran faces with different types of physical and social problems. So, these problems are effective in creating defenseless spaces in this neighborhood. In order to investigate defenseless spaces in Harandi neighborhood, the safety audit model was used. ...