Driven by the "dual carbon" goal, urban planning will usher in new challenges and new changes. The island garden city is an active and effective exploration of the island-type city to implement the "dual carbon" goal. Based on the analysis of the connotation and relationship between "dual carbon" and "garden city", this paper studies the successful experience of domestic and foreign garden cities by combing the overall characteristics of island cities in China, and puts forward the planning and implementation path of the island garden city, which includes to protect island ecologically, use island greenly, build island with quality, beautify island with style and features, and revitalize island with culture.