With the rapid development of China's construction and design industry, interior design by combining the traditional needs of people's material life began to change into the spiritual needs of people, the higher requirements of safety, comfort and beauty began to appear, such as private. In the process of interior design, to create a comfortable and beautiful house, privacy, security and internal environment, we must through the study of the psychological activities, through the design of ornamental psychology and experience activities to indoor environment, color, vision, feeling the effects of the people. This article through to the design psychology theory as well as the design psychology effect elaboration and the analysis, discusses the design psychology in the interior design concrete application.