Taxonomy is regarded as one of the bases of Biodiversity, and is required to establish certain objective standards to identify any alien species with conventional morphological approaches. In this sense, identification methodology using genetic markers is recognized to reinforce the shortcomings of traditional approaches. Therefore, this project aimed to provide practical trainings of investigation techniques for the molecular phylogenetic analyses to the researchers of Southeastern Asia. Furthermore, it aimed to establish regional network of researchers for developing research collaborations in the study of non-indigenous marine algae. Exchanging taxonomic and genetic information of local populations in the adjacent areas is important factor in studying non-indigenous taxa. By the financial aid of APN and International EMECS center, and also by in-kind support of Asian Pacific Phycological Association (APPA) and some local members of the North Pacific Marine Science Organization (PICES), 12 young enthusiastic trainees from Cambodia, China, Indonesia, Malaysia, Thailand and Vietnam were trained. Through training, the young researchers were able to develop their skills on using molecular marker in Taxonomic Identification and it ultimately benefit to distinguish native and alien seaweed species in the Asia-Pacific region.