Government policy empowers tuna fisheries continuously on RFMO, which obliged Indonesia become a member of IOTC. IOTC is as an organization that develops fisheries conservation management, which have role in regulating tuna resources. This qualitative research aimed to examine legal study of Indonesia's policy as IOTC member. This analysis is conducted by normative juridical method and case study approach, which presented descriptively. The results showed that the Indonesia's membership area (IOTC) of Benoa-Bali, has not been supported by administrative arrangement, institutional, structural, regulatory, data, and system firmness authority on its officers.The recommendation policies of this research: to construct a good management of administration, institutional, structural, data; managing in strict surveillance authority at sea; provide a legal certainty which attached on its field personnel function; establish an independent institution under KKP to address the problems, challenges, and looking forward the opportunities on fishery management.