Due to the natural environment and the consumption of the earth's resources, the ecological damage and resource depletion have become a serious problem facing the world in recent years. To understand the design process of the interior decoration and its associated environmental issues, a plan was developed on how to introduce the green interior design concept with a view of creating a safe, healthy, green low-carbon and high-quality living space, where The FDM, AHP and cloud theory were used to deal with complex interior renovations decision issues mainly due to information uncertainty, time lapse and complexity of the problems, with, therefore, the feature cloud model employed to analyse multi-stage risk decision problems. The research results enabled customers to make decisions quickly without relying on the personal experience and ability of designers and experts. The GID decision model verified the feasibility and rationality of the method proposed in this study, which, having high analysis ability was capable of accurately predicting decisions.