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The purpose of this study is to verify the inefficiency of the existing regulations on daylight exposure for Multi-Family Housing under 20 units, and suggests an alternative regulation to ensure daylight exposure to improve the quality of residential environment. This study consists of two parts. The first part is to analyze and evaluate the effects of the existing regulations on daylight exposure. Here, the existing regulations on the building are divided into ‘shape-control’ and ‘bulk-control’. The ‘shape-control’ is the regulation to control the envelop of a building, and ‘bulk-control’ is the regulation to control the building density. The second part is to find out the limitation of the existing regulations and propose an alternative regulation to ensure daylight exposure. The findings are as follows: First, ‘Height Limits on Building’, the only regulation of the building law to ensure daylight exposure, actually could not guarantee the minimum daylight exposure to the Multi-Family Housing under 20 units. Second, not only ‘shape-control’ but also ‘bulk-control’ has an influence on the amount of daylight, because ‘bulk-control’, which consists of Land Area Coverage and Floor Area Ratio, altogether decide the height of buildings. Third, as an alternative regulation to maintain minimum daylight exposure in the aspect of ‘shape-control’, the daylight oblique line coefficient (H/L) is needed to be adjusted from 2.0 to 1.0.