This paper describes the characteristics and outline of Authorized Economic Operator(AEO) among countries.(Korea, United States and European Union). Now, The Authorized Economic Operator(AEO) certificate is an internationally recognised quality mark which tells people that your role in the international supply chain is secure, and that your customs controls and procedures are efficient and compliant. With an AEO certificate you can be considered a secure trader and a reliable trading partner. But, For a Customs Simplification Authorized Economic Operator(AEO) certificate, you must fulfil the criteria for compliance, record keeping and solvency. For a security and safety, you must also fulfil the security criteria. In case of Korea, The member involved in AEO increased slowly after institution of new regulation for AEO. Thus, To be successful operation of Authorized Economic Operator(AEO) in Korea, the Korea's customs must support business community in terms of cost.