Objective:This study aimed to explore more on contributing factors and prevention of overweight and obesity among Pacific islanders.Methods:Using Cochrane library guideline,four electronic databases,PubMed,Embase,Scopus and CINAHL,were systematically searched from 2010 to 2020.Search strategy included key concepts,free text terms,and database-controlled vocabulary terms to identify articles on determinants and preventative strategies of over-weight and obesity in the Pacific countries.A data extraction sheet was developed to extract relevant information required for analysis and theme development for this study.Results:A total of 22 articles were summarized and categorized.Determinants of overweight and obesity iden-tified two themes:environmental related factors 13.6％(3/22)and sociocultural related factors 27.3％(6/22).The preventative strategies of overweight and obesity was categorized into behavioural change 22.7％(5/22),school-related 18.2％(4/22),and policies 50％(11/22).The quality assessment of articles showed"Good"68.2％(15/22),and"Fair"31.8％(7/22).Conclusion:This study highlighted two contributing,non-medication factors affecting overweight and obesity are both environmental and socio-cultural issues.Overweight and obesity preventative strategies identified in the Pacific context considered behavioural change,knowledge enhancement,and policy development.Further research should aim at exploring the current preventative strategies in-depth,to appreciate the most feasible and recommended preventative approach within the Pacific society.