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The purpose of this study is to analyze the thermal of an office building, as well as the external louver shade scheme suitable for windows in various directions of the building in different climate divisions in China. The results are as follows: In Lanzhou, dimming control has little effect on lighting energy consumption. Therefore, when the horizontal louver has a blade width of 120mm, the spacing 300mm, and the angle in the west is 30°-45°, the angle in the south is 75°-90° the energy saving effect is proved, and the building's discomfort glare of the building can be reduced. Due to the small energy savings in the east direction, it is not economically feasible to set fixed external louver for shading. Setting a fixed external shade is thought to be more appropriate. In Chongqing, the energy saving effect of cooling and heating load, the block effect of discomfort glare is good when horizontal louvers are set in the west direction with the blade width 500mm, the spacing 500mm, and the angle 15°-45°, as well as when horizontal louvers are set in the east and south directions with the blade width 300mm, the spacing 500mm, and the angle 15°-45°. However, the setting of louver shade in the set of dimming control will have a great impact on the lighting energy consumption demand, so the total energy saving effect of the building is relatively small. In Shenzhen, When horizontal louvers are set in the east, west and south directions, with the blade width 500mm, the spacing 500mm, the east angle 15°-45°, and the west and south angle 30°-45°, the energy saving effect is enhanced, and the discomfort glare can be effectively avoided. However, when the dimming control is activated, the louver shade consumes more lighting energy, resulting in an increase in the total energy consumption.