Based on the physical process of the urban heat island (UHI) effect, the Urban Heat Island Intensity Model is established by solving the energy balance equation with the analytic method, which provides a basic model for further research on the correction of outdoor calculating parameters considering the impact of UHI. This model includes two parts: the urban surface energy balance calculation module and the urban canopy energy balance calculation module. At the same time, the Global (UHI) Data Set and the observation data in Xi’an, Birmingham, Madison, and Basel are used to verify the model. The validation results show that the urban under-lying surface energy balance calculation module has high calculation accuracy in both rural and urban areas (rural: RMSE<1℃; urban: RMSE<3.2℃); the calculation accuracy of the urban canopy energy balance calculation module is high (RMSE<1.5℃), which is similar to that of the same type of models, and the modelled data has a high consistency with the observation data. The observation data is used to verify the rationality of retaining only the first-order term in the construction of the urban heat island intensity model (RMSE<0.7℃). The sensitivity analysis results show that the sensitivity of urban underlying surface parameters are affected by climatic conditions; the wind speed is the most sensitive parameter in meteorological data.