The results of this dissertation show that, current Islamic penal code unlike the previous one, regulates the repentance and cites its rules in Hodud and Taazirat completely and accurately. Repentance in the majority of Had crimes is recognized. In Taazirat except for a few cases, Repentance will not omit the punishments and just mitigates them. Islamic penal code, cites in some articles procedural rules relating to repentance and hence, has made clear the task of the courts. Unnecessary restrictions for accepting repentance in a few cases, are amongst criticisms to the Islamic penal code. The condition of detection of reform and penance of repentant without determining a criterion is among other criticisms of the Islamic penal code. After all as previously expected, Islamic penal code regulated the Repentance institution as a complete set, as well.