SUMMARY
One of the principles of education is to use the method of encouragement and punishment. Punishment has methods, types and etiquettes. The main question of this research is what are the types of punishment of offenders by Amir al-Mu'minin Ali (AS) and how did he punish the offenders and what etiquettes did he observe in punishing? The method of collecting data in this research was library and the processing method is descriptive-analytical. After investigations, it was found that Imam Ali (A.S) used different method. After investigations, it was found that the types of punishment for offenders by Amir al-Momenin are 1- warning, 2- threatening, 3- dismissal, and 4- punishment. He also observed etiquette in punishment, including that the punishment was carried out in proportion to the person, and the punishment was commensurate with the offense, and they avoided excesses and negligence in this regard. He never punished with personal intentions and explained the reason for the punishment to the offender and his encouragement and punishment was in an appropriate manner.