The main purpose of the present study is, to investigate the recognition of psychological trauma in the preparatory stage of legislative research in Iran, with an emphasis on recent laws of the Islamic Republic of Iran, including: Islamic Penal Code, adopted in 2013, as well as the Code of Criminal Procedure of 2013. In this research, the author has tried to technically and expertly identify both the material and the spiritual aspects of psychological damage, and finally, by knowing and providing the appropriate criminal policy in the laws, it helps the process of rapid prosecution, investigation, and prosecution and reveal the importance and the subject to avoid the prolongation of the judging process. The method of research is a library procedure. In light of the foregoing, it can be admitted that crime, the use of material sciences and the status of the detection of crimes in the preparatory phase of investigation, such as crime detection, crime proof, identification of offenders for the purpose of providing criminal justice, and the study of material grounds for crime prosecution through the works and documents obtained from crime scenes, such as the behavior and psychological states of individuals, have a particular value and is often somehow certain in the knowledge of the judge in proving the charge or removing the charges. In existing laws, especially the new Criminal Procedure Code, the importance of this issue is mentioned and, even in certain cases, the legislator has clarified with specific precision and obsession.