Global, trans-national and cross-border threats posed b  y terrorism have led a significant number of regional organizations to become more involved in countering this menace.ASEAN member-states has promoted to realize ASEAN security community in this regard. The ASEAN Convention on Counter-Terrorism (ACCT) 2009 was ratified and enforced among the Association of Southeast Asian Nations (ASEAN) countries primarily focused through an ASEAN Regional approach in countering the violent extremism or in ‘countering terrorism’ in this region.ASEAN’s security model has been defined by an inward-looking approach to security and regional stability. Rather than concentrating on external military threats, the ASEAN members have favored a comprehensive security agenda. ASEAN’s bottom-up approach to security has been applied to the threat of terrorism. Away from the traditional security threat assessments, the emergence of the Islamic State in Syria and the Syria (ISIS) presents a new and dangerous threat to regional stability and global security in relation to the magnitude of participation of foreign fighters. While terrorism refers to actual acts of violence, violent extremism and radicalization describe the way by which people come to embrace views and ideas which could then lead to violent action. Consequently, while counter terrorism (CT) generally refers to the "hard" measures to tackle terrorists (e.g., targeted killings), CVE is generally thought of as the "soft" side of CT, or the use of non-coercive means to dissuade individuals or groups from mobilizing towards violence. This paper examines the effectiveness of the counter terrorism approach of ASEAN especially through the ASEAN Convention on Counter-Terrorism (ACCT) 2009. It also analyzed the preparedness of this regional organization in countering the new nature of terrorist threat element like foreign fighters, and testify its concern about CVE followed by some recommendations which might be found empirically suitable in formulating and implementing the future strategic plan for the regional CT actions.