Heat loss through windows and doors occupies 20 to 40 % of the total heat loss in building. It accounts for a large proportion of the total heat loss in building. In order to suppress the amount of heat flow through the windows and doors were considered actions such as reinforcement of insulation performance of window, adoption of low-e glass, and installation of solar heat shading device. The Purpose of this study is to compare solar heat shading performances of 5 types of internal blinds in the summer. In order to verify the solar heat shading performances of the blinds, we set 2 experiment. we set 3 types of internal blinds in the experiment 1 and set 4 types of internal blinds in the experiment 2.
Experiment 1: a roll blind, blind A(Venetian blind) and blind B(Venetian blind)
Experiment 2: a roll blind, blind C(Aluminium powder coated roll blind), and blind D(Daylight guiding venetian blind)were installed in the rooms with the same environmental conditions.

As a result of the experiment 1,
1) The blind B, blind A, roll blind showed higher temperature in that order(indoor air temperature, Indoor globe temperature, surface temperature)
2) The blind B, blind A, roll blind showed higher temperature in that order(Indoor long wave radiation)
3) The blind B, blind A, roll blind showed an excellent performance in that order. Its because the blind B is made of aluminum materials coated with special paints on surface. It doesn''t converted to long wave by short wave light. and it is reflected to short wave to outside.

and as a result of the experiment 2,
1) The blind C, blind D, blind A, roll blind showed higher temperature in that order(Indoor globe temperature, surface temperature)
2) he blind C, blind D, blind A, roll blind showed higher temperature in that order(Indoor long wave radiation)
3) The blind C, blind D, blind A, roll blind showed an excellent performance in that order. Its because the blind B is made of polyester materials coated with aluminum powder on surface.