This study focused on the legal action of terrorism cases in Poso, Central Sulawesi. The focus of the analysis is to accentuate the contents of the legislation related to the legal handling of terrorism cases in Central Sulawesi. Thus, the study was carried out through statute, comparative law and conceptual approach, as well as using qualitative data analysis method. Data were processed by first describing all the legal materials that had been collected through inventory, identification, classification and systematization according to the problems in this study. Material reconstruction was next, including rearranging legal materials sequentially and logically. The last step was analyzing legal materials systematically based on the sequence of problems. National and global scale terrorism groups have well understood the consequences and legal actions of terror acts. The maximum, multiple layers of punishment have been stated in Law No. 15 of 2003 concerning the Eradication of Criminal Acts of Terrorism as an effort by the Indonesian government to suppress the movement of terrorism groups. The legal action process, especially in the Santoso’ Group, is based on Law no. 15 of 2003 with a sentence of 6 to 15 years in prison and a 6 (six) months subsidiary confinement with reference to the Theory of Retribution and Prevention.