Based on the interviews with the visitors to the prototype of apartment room in 2003, the relation between the selection and its reason of living room interior decoration is analyzed by the Association Rules. The conclusions are given as follows. The procedure of selection the living room interior decoration is based on the coordination between the plain and decorated interior step by step. It leads to the balance point between them. Although most of the interviewees hope that the living room interior decoration be plain, there are differences in the attitude to exhibit their daily life, which is hidden from the image of simple interior decoration.
