Culture identity is the base of ASEAN cooperation. Culture can be viewed as a kind of value, which means how to pursue its security and wealth for one nation in international relations. The culture identity of ASEAN countries is manifested by their identity to ASEAN Way, which includes the rules of non-interference of internal affairs, consultation and consensus, and organizational informality. Their identity to ASEAN Way is decided by their security environment and has become the key for ASEAN success, although it faces some challenges nowadays.