Study This aim for knowing and analyzing arrangement about provision fine peace in law positive Indonesia and how ius constituendum fine peace to achieve principle certainty law and justice law, as well as harmonization its implementation. The research method used is normative legal research with a statutory approach, a conceptual approach, a historical approach, and a comparative approach. Based on the research results, it shows that the regulation of peace fines in economic crimes is regulated in Article 35 paragraph (1) letter k of the Prosecutor's Office Law, Article 65 letter i, and Article 66 of the new Criminal Procedure Code, which regulates peace fines as a mechanism for terminating cases outside the court. However, the absence of implementing regulations has created a lack of clarity in the norms, so that it is necessary to establish technical regulations regarding the procedures for their implementation. Through comparison with Belgium and the Netherlands which already have a clear legal basis and implementation procedures, it is hoped that a Government Regulation will soon be formed in Indonesia containing detailed, clear and firm rules regarding the procedures for implementing peace fines to realize legal certainty, legal justice, and harmonization of implementation for all economic crimes that can be subject to peace fines in Indonesia.