In recent years, many glass walls came to be used for building surfaces. In the radiant environment of a street canyon, if glass walls increases, the diffuse reflection component of the solar radiation will decrease and the specular reflection component will increase. Therefore, in this study, the influence of glass walls on the radiant environment of the sidewalk space in a north-south street canyon was analyzed under the weather condition of the daytime of a summer season using the numerical simulation. Building facade was constituted from glass walls and concrete walls, the case study on the facade model of six types was performed, and the following results were obtained about influence on solar-radiation reflection. 1) By the difference between models, the temperature difference occurred 6K in the mean radiant temperature (MRT) in sidewalk space at the daily maximum time. 2) The MRT of sidewalk space is increased in the model which has diffuse reflection walls in the part of building facade near the sidewalk. 3) As mentioned above, it was shown that the reflective property of facade influences greatly to the thermal environment of sidewalk space.
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