Eco-cities are desired as healthy human settlements in which self-sufficient, targeted to the deterioration of the balance between natural ecosystems and built environment. In the literature; the pre-conditions which is vary in aspects of environmental, social, economic, spatial and legal characteristics as eco-cities are defined. At present, many countries, including Turkey, have been attempting to establish eco-city projects succeed in different levels. In this process, Many issues are encountered as problematic factors. These factors can be categorized primarily as legal, administrative and project related procedures and process issues. The role of 'actors' and actor relations, economic and socio-cultural structures take part in this outlook at different levels. The purpose of this study is to examine the examples of eco-city projects. All such project attempts have varying problems about putting the theory into practice, determine the most effective tools and procedure. As the method of this study, the process of these eco-city projects have been examined with this factors. The methodology includes surveying such as contacting to concerned institutions to identify related problems. In addition; categorically chosen examples of eco-cities around the world have been studied for comparision. The same parameters and methodology have been followed in this comparative study. The comparative outlook helped to grasp the problematic ingredients of the process which determined in the projects' success or failure, through this, whether the parameters in the projects have common characteristics or not, is investigated. Consequently; critical assessment through the findings, and suggestions to increase the success rate in the implementation of the eco-city projects.