This Paper focuses on discusing how to select, arrange and evaluate furniture and how to estimate the space of the living room.In this Paper, the size of the living room was manipulated in 3 . ways;66-95.7m2, 99-128.7 m2 and more of 132 m2.The major findings are as follows:1) The subjects in the larger size select or arrange furniture more diversely and show the higher satisfactory level for the arrangement of furniture than those in the smaller ,size do.2) The subjects in the smaller size shows the conflict between their plan for the furniture ulcorner arrangement and their evaluation for the arranged furniture.3) The variables affecting the estimation of the living room are the arrangement, the color, the number and tile design of furniture.4) Five dimensions(activity, evaluation luxry, plenty and openness)are extracted by factor analysis.