Objecyives: The stydy examines the influence of the built environment (defined as fast-food oulets density, supermarkets density and play grounds density), and assesses the “Obesogeic environment” in Taiwan. The aim of this study is to scrutinise the concept of the obesogenic environment in Taiwan and to highlight the inportance of the built environment related to the adolescents’ obesity. Methods: Date was obtained from National Health Interview Survey in 2001 (2001 NHIS) and National Health Interview Survey in 2005 (2005 NHIS). First we computed fast-food oulets density, supermarkets density and play grounds density and than find out the “hot spot” of obesogenic environment in Taiwan. Hierarchical llogistic regression models were developed to test whether the densities was associated with adolescents’ obesity. Also we separated the data according to the results of spatial autocorrelation, and logistic models were developed to see the relationship between built environment and adolescents’ obesity. Result: The result of spatial autocorrelation analysis indicated the hot spots of obesogenic environment in Taiwan and where are located on the well-developed cities. Nothing were found with hierarchical llogistic regression models though age, gender, race, weight control and the intake with high dense food are related to adolescents’ obesity. Nevertheless, we find out that the relationship between adolescents’ obesity and the individual variables (race and the intake with high dense food) differs from obesogenic environment and non-obesogenic environment. Conclusions: The study suggests that built environment we live a life may attributes to the increased prevenlance of adolecents’ obesity. The location and characteristic of obesogenic environment in Taiwan is different from the U.S.A. and England. Age, gender, race, weight control and the intake with high dense food are related to adolescents’ obesity. Nevertheless, the characteristic of built environment may influnceed adolesents’ race and diet related to obesity.