Architects design buildings in consideration of constraints such as law, owner's request, relationship with neighbors and their endurances. Compared with buildings, installations have less constraints and are characterized by space expression with high degree of freedom and carefully selected elements. Therefore, principles such as the features of the element and the mechanism of composition appear prominently on works. In this research, the objective is to reveal how architects perceives and realizes principles when architects perform creative activities by analyzing the text description on the installation works, which prominently expresses the principle caught by the architect.