In order to make the adjustment of blinds angle in double skin facades (DSF) more scientific and reasonable，the models of indoor comprehensive heat and average daylight factor were established，respectively.Based on the standardized process of the above two models，the evaluation model of the blinds angle of DSF was established by using the linear weighted method.The construction process of the angle evaluation model in Changsha under the condition of natural ventilation from 8 to 18 was introduced in detail.Through the simulation analysis，it is found that in sunny summer of Changsha，the optimum angle is 82°，and the optimum angle range of blinds is 73° to 90°.In cloudy summer of Changsha，the optimum angle is 0°，and the optimum angle range of blinds is 0° to 36°.