By using marketing research technique, this paper tries to analyze: (1) how urban green space attracts people's preferences, (2) the combination of the levels of each urban green space attributes, such as park and street trees, which maximizes public preferences, (3) the relative importance of urban green space attributes. Out of many attributes of urban green space, four attributes were selected, and 10 profiles were created. The results established that urban green space increased people's preferences, and "street trees" was the most influential feature in their preferences among the attributes. Also this study showed that people prefer a city that includes street trees of which height and volume are appropriate, park, flower garden and plants in the street. In view of the partial utility score, in order to attain the same utility score of "street trees" even in the place which doesn't have enough space to plant trees, we found that it would be an effective solution for the local governments to green the streets and building a garden, or to aid such activities.