In this study, we dealt with the diagnosis of criminal hazard. This research was divided into three sections. We discussed in the first topic, criminal behavior. It was investigated through two demands. In the first, we discussed the factors of criminal behavior, showing internal and external factors that have a direct impact on behavior. The second topic was devoted to researching the character of the criminal and was examined through two demands that we discussed in the first, the criminal and his inclination to criminality, and in the second, examining the character of the criminal. The third topic was the classification of criminals, and it was discussed in two requirements.