Social developments, especially in the field of criminal law and criminology, have a significant impact on crime prevention and fighting. This article examines the various dimensions of these impacts, including changes in crime patterns, increases or decreases in specific crimes, and adaptation of policies and laws to social needs. Social developments, in the field of criminal law and criminology, have not only led to changes in criminal patterns, but also created new challenges and opportunities to fight crime. This article tries to improve the mechanisms and legal policies to deal with crime and maintain the security of the society by examining these effects more deeply and analyzes various aspects of this relationship. Social changes, including changes in family structure, increase in technology, and economic changes, have affected crime patterns. For example, the increased use of cyber space may lead to digital crimes. People may find new ways to commit crimes with changes in social conditions, and this requires new and updated research in the field of criminal law and criminology. In addition, the number of specific crimes has also been affected. For example, during times of social change, some crimes may increase, while others decrease. This article emphasizes in detail the type and frequency of these crimes and tries to analyze the causes of these changes. In this context, policies and legal laws must also be synchronized with social developments. Compliance of these policies with the needs of the society ensures the increase of productivity in dealing with crime and the maintenance of public safety. In general, the article deals with the deep analysis of the effects of social changes on the field of criminal law and criminology and pays attention to the improvement of policies and strategies in this field.