In this paper,the temporal and spatial characteristics of urban heat island effect in Tianjin city in the year 2008 were analyzed by using the observation data and the 6 h ground general data from 14 automatic meteorological stations in Tianjin.The results showed that the urban heat island effect in Tianjin not only had significant diurnal,monthly,seasonal and annual variation characteristics,but also was closely related to the method to choose urban and suburban stations.Finally,the relationship between urban heat island intensity and cloud,wind,humidity was analyzed by using the multiple linear regression analysis method.It was found that the wind speed was a dominant meteorological factor,but the overall impact of the meteorological elements on the urban heat island effect in Tianjin was relatively limited.