As a kind of indefinite punishment, the discretionary punishment is the most. pervasive reaction to criminality in the Islamic penal policy. The efficacy of the discretionary punishment depends on how we use it to adjust the foregoing reaction to the guilty personality. Some Shi'a jurisprudents believe that just like Prohibition of the Evil, the discretionary punishment should be used by observing gradation. That is, it should be started from low grades such as warning, reproaching, etc. in petty offences, and in case the wrong deed is repeated. the more severe punishments such as imprisonment can be used. In other words, if the judge knows that deterrence can be attained through slighter punishments like reproaching, he/she should not issue the whipping, imprisonment. or suchlike severe punishments in the first occurrence of a petty offence. With regard to the extensive reliance on the imprisonment and physical punishments in criminal laws and the widespread use of imprisonment by judges, even for the first-time offenders-which has led to the increased density of convicts' number in prisons - specification of the discretionary punishments can be of great use. The article explicates the viewpoints of those Islamic jurisprudents who believe in the discretionary punishment gradation, presents the benefits, positive effects, and challenges facing this kind of punishment, and provides a clear-cut, practical, and effective proposal that can be applied in the penal policy. In addition to the Sunni jurisprudents, some early Shi'a jurisprudents such as Sheikh Tusi (May he reside in God's paradise) and some contemporary ones such as Mirza Javad Agha Tabrizi (May he reside in God's paradise), Fazil Hendi (May he reside in God's paradise) - the author of Kashf al-Letharn-and Allameh Helli (May he reside in God's paradise) are the main adherents of this viewpoint. whose respective opinions will be examined in the article. Acceptance of the discretionary punishment gradation theory in the penal law can bring about several positive consequences, including reduction of the convict's number in prisons. the possibility of better planning for the fewer remaining prisoners, and the possibility of adopting rehabilitation programs for those who have committed an offence due to ignorance and obliviousness.