Among offenses committed by adolescents, robbery has a noticeable importance. Robbery is not a new phenomenon associated with the new period, it has been one of the oldest committed crimes among adolescents, and however, what matters is the prevalence of this crime among adolescents at the present time. Some of the criminologists believe that prevalence of robbery among adolescents is more that other common crimes. To their belief, it is also possible to relate the issue of children and adolescents’ crimes to their committing robberies. The main purpose of the present paper is to study impact of patterns of criminal behavior on simple robbery among adolescents. In order to achieve this purpose,70 adolescents at the age range of 15-19 at correction and rehabilitation center located in Alborz province have been studied based on the researcher’s questionnaire, previously done researches and experts’ opinions in 2012. The researcher’s questionnaire includes demographic factors that affect prevalence of robbery among the adolescents. Results of the present paper show impact of each of the variables on prevalence of robbery among adolescents. In fact, beta weight of parental crime background equals 0.336, beta weight of adolescent’s friends’ crime background equals 0/139, beta weight of having a tendency toward modeling friends’ criminal behaviors equal -0/508, beta weight of offense commitment at adolescents’ educational environment equals 0/150, beta weight of watching movies in which robbery is committed equals -0/190, and beta weight of living in areas where lots of crimes occur equals 0/137. Generally, with regard to the corrected coefficient of coordination determination, beta weight equals 0/62.