The internal shading can both impact on the sunshade and indoor daylighting, and work as an indoor heat source by absorbing heat. Presently the evaluation of overall energy efficiency of the internal shading is perceptual and qualitative. Therefore， the tests of the internal surface temperatures of house envelopes and the daylighting illuminance were carried out. It is shown that the surface temperature of interior walls with internal shading are 0.6℃～1℃ lower than those without; however，the surface temperature of internal shading is 3℃～5℃ higher than that of the interior walls. It can be seen that internal shading also forms an indoor heat source. The energy consumption of air-conditioning with internal shading decreases by 17.24% than that without, which indicates the internal shading can certainly reduce the indoor air conditioning load; however, the daylighting illuminance declines by 81%, with the results that the artificial lighting energy consumption is 1.88 times as much as that without the internal shading.