The purpose of this study is to find major factors which are influential in visual preferences of pergolas and shelters. 33 pergolas and shelters were selected for the study by slides test method. Major findings of this study are summarized as follows. 1. In the degree of visual preferences, pergolas and shelters which are traditional Korean ones in harmony with surrounding environment, and provide sculptural effects, unique images and shade, obtain relatively high scores. 2. The result of factor analysis showed that [dimensions] of visual preferences factors for pergolas and shelters were composition and use and place. 3. The result of regression analysis indicated that the best predictors of visual preferences for pergolas and shelters were atmosphere, aesthetics of form, harmony with surroundings, unique image etc.