Ecological and livable cities need an objective method to be jugged. This paper is in search of a method to determine the level of livability and ecology of the cities.Examples chosen for this methodology are: 1.DongTang (Shangai, China); 2.Masdar (Abu Dhabi, United Arab Emirate); 3.Arcosanti (Arizona, USA); 4.Chang Chun (China); 5.GlobeTown (Nizhny Novgorod, Russia)The results show that livable city should be in the pursuit of the overall development and ecological progress. Ecological city needs to properly make up for the weakness of city construction under fine ecological environment. Keywords: Eco cities under construction, Comparative analyses of eco cities, Eco-deficit of cities.