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Based on the modeling and analysis of the glass sun-shading mechanism the hourly building cooling energy consumption of an office building in Guangzhou was calculated for different building glass with various inferred transmitted rates. The results showed that the glass sun shading coefficient and the building cooling energy could be significantly reduced by decreasing the inferred transmitted rate of the glass for the constant visual light transmitted rate of 0.6. The sun-shading coefficient of the glass could be significantly reduced from 0.856 to 0.363 as the inferred transmitted rate was decreased from 1.0 to 0.0. As the inferred transmitted rate of the building glass was decreased from 1.0 to 0.4 and 0.0, the building cooling energy could be reduced by efficiency coefficients were 13.7% and 23.3%, respectively. The findings that the significant energy efficiency could be obtained through decreasing the inferred transmitted rate at the constant visual light transmitted rate provide a useful guidance to the design of the functional building glass and the building energy efficiency.