The aim of this study is to explore the effect of urbanization on temperature change in regions nearby cities in order to realize the climate and enviroment change in regional scale. [Methods] Based on the temperature data recorded by meteorological stations nearby Beijing and Tianjin cities during 1973-2008, annual and seasonal temperature variations and the impact of urban heat island(UHI) on meteorological stations(known as urban impact indicator, U_ii) were analyzed, with the consideration of urban size, relative position of meteorological station to city and winds. The bias in surface air temperature records was estimated as well. [Results] (1) Due to the influence of urbanization, the warming rate in Beijing station was faster than that in Tianjin station during 1973-2008, and the warming rate reached to 0.65 ℃/10 a and 0.17 ℃/10 a in Beijing station and Tianjin station, respectively. (2) The impacts of UHI on the same station were different in different seasons, and this impact was much more severe in Beijing station, compared to Tianjin station. (3) Urbanization had a strong influence on the surface temperatures in Beijing and Tianjin stations, and urbanization contributed the most to the warming of annual minimum temperature, and the contribution rate reached to 56% and 100% in two cities, respectively. [Conclusion] The impact of urbanization needs to be considered when studying regional climate change in the areas nearby cities.