The aim of the research is to identify the causes of the phenomenon of street children in the city of Port Said. It also aims to identify street children personal traits and behavioral deviations. It also aims to determine whether there are differences between the sexes in terms of behavioral deviations and personality traits. The researcher used the descriptive correlative approach, the study sample consisted of (100) individuals, they were applied to the personality traits scale, and the behavioral deviations scale, the results showed that the causes leading to the phenomenon of street children are many but the most important of which is the breakdown of the family, and also existence of gender differences in behavioral deviations in favor of males, the results showed no gender differences in personality traits. The results also established a link between behavioral deviations and personality traits.