In order to evaluate the cause of urban thermal environment formation, and grasp the distribution of it, the analysis about urban climate by numerical simulation and field survey using outdoor air and earth surface temperature were carried out. In numerical simulation using 1-dimentional heat balance model, because of giving the temperature corrected by design outdoor temperature, day-range air temperature change near the actually one was gotten, and it was found out that good operation of the land-cover factor keeps lower earth surface temperature. From field survey, actual formational factor and distribution of urban climate was clarified.
