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Combining GPS(Global Position System) and the data logger system,mobile measurements were carried out under clear weather and light wind conditions to research the urban heat island effect in Beijing.The impacts of different surface covers on urban local climate and the distribution of meteorological elements are investigated.The results show that the urban building-concentrated areas with less water and less vegetation have higher air temperature and lower relative humidity compared with the rural area.The mobile measurements are a useful supplement to conventional observation,and the mobile measuring approach is an effective method for urban climatic observation.