In view of the problems existing in current underground garage, underground garage is considered in the design of Tongcheng Yuli district. The square PC plate dormer window of pyramidal of size 3×3 meters is set in the roadway above. After the completion of the building, the field measurement and questionnaire survey have been conducted in a synchronous way. The statistical method was used to analyze the data and the conclusions are as follows: the decline speed of the illumination is rapidly first and then slowly with increase of distance from the dormer, and is the exponential distribution. Lane illumination and distance is also exponentially. For side lighting, when luminance meets the minimum requirements of 301x, a reasonable distance limit is at 14.3 meters, and the basic 2 column; While bilateral lighting, lighting distance is limited to 30 meters and is about 4 column size. The design points of the underground garage and the comfortable condition are analyzed. This paper will provide reference and basis for the design of the underground sunlight garage in the future.
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