The institution of multiple offenses in the Penal Code is one of the aggravating causes of punishment, which has been considered by the legislator due to its importance in the field of reform, rehabilitation, and crime prevention, and has continued its evolution towards creating positive developments. The latest development in this field is related to the Law on Reducing Penalty Sentences, passed on May 13, 2020, in which the legislator has tried to reduce the inefficiencies related to the multiple offenses in the law by creating innovations and also returning to some of the criteria of previous regulations, including the General Penal Code passed in 1973. The main purpose of this research is to examine the wandering legislative criminal policy of the legislator in the past five decades. In other words, in this research, we are looking for the reason for the wandering of the legislator's criminal policy in cases of multiple offenses. Therefore, in the first step, by stating the criminal policy regarding the multiplicity of crimes in different periods, we will address the issue that the legislator has not had a single policy towards reforming and transforming the institution of multiplicity of crimes and has acted indecisively in this regard.