This document specifies the natural environment exposure test methods for interior decoration materials, including indirect exposure test under Glass, test under shelter, test under louver or window test shed and simulated building test. It is suitable for evaluating the performance changes of these materials under indirect exposure conditions in the natural environment. The environmental conditions of the exposure test field should be selected to represent the typical environmental conditions of climatological types, such as open all around, flat ground, no water, no weeds soil or sandy ground. At the same time, attention should be paid to the distance from the surrounding obstacle to the edge of the exposed field at least three times the height of the obstacle to ensure the relative stability of environmental factors.