Abstract: In the light of the variety of the contributing factors of climate,a new method is put forward to study the effect on local climate elements of the urban development.In the method,the means of variance analysis and simplifying dividing wave are used to eliminate the effect on local climate of factors which don't belong to urban development. Using this method,the effect on the Hefei's temperature of urban development is studied. The result reveals that urban development affects local temperature obviously,especially in the lowest air temperature.