|Accelerating industrialization increased negative consequences related with resources and ecosystem which in turn increased importance of sustainable development strategies depending on regional dynamicsand local resources. Slow City (Cittaslow) movement serves a collaborative sustainable development model that focuses on both protection of local values and local economy including all stakeholders in the process while supporting social transformations in its own global local network. This study examines the changes in Seferihisar’s – Slow capital city of Turkey – local economy after the membership of Slow City movement in terms of economic and social changes. In this study, purposive sampling was used and the data was collected with interview method from the team of Seferihisar Municipality which actively engaged in Cittaslow activities. The data was analyzed with content analysis method. At the end of the study, it was found that Seferihisar’s local economy is changed in domains of status in global network, local production and consumption and social situation. The unique value of this study is discussing about negative aspects of changes which are not elaborated before and interaction between economic and social transformations.