The service object of indoor environment design is people. Therefore, in the fields related to life and production, interior design is closely related to ergonomics such as listening, seeing, smelling, breathing and touching. As a comprehensive discipline and major, it has designed many disciplines. Therefore, we must proceed from the overall demand, grasp various elements, and comprehensively deal with the combination of space and block shape, proportion, color, materials, as well as indoor furniture layout, lighting, wall hanging furnishings and other environmental atmosphere. The specific content of indoor environment design can be summarized as: 1 space adjustment On the basis of architectural design, the shape, scale and proportion of space are adjusted as needed, the space is re-divided in a large space, and the large and small spaces are combined according to the relationship. Pay attention to the spatial hierarchy and the contrast between reality and reality, and solve the problems of convergence, transition, contrast and unity between spaces. The spatial environment in which people live and move, whether it is a small building, a small building, a passage or a square, will inevitably be infected by the environmental atmosphere and produce various aesthetic reactions. The relationship between the scale of space and human body, the separation of space and psychological reaction are the important basis of space adjustment. The division, size or height of indoor space depends on the functional requirements of the environment. We should not only meet the material needs of people's lives, but also meet the spiritual and cultural needs. The application of six-sided decoration and color is the main part of indoor environment design and decoration, which is six interfaces surrounded by four walls, ceiling and ground, as well as indoor facade, interface situation and modeling design, material texture and color application, structural construction practices and so on. For the elements of indoor space separation, the most basic ones are walls, floors and ceilings. Therefore, in interior design, the treatment of walls, floors and ceilings (referred to as "three sides" for short), including the selection of materials, structural forms and decoration, has a great influence on the creation of indoor environment and atmosphere. "Three-sided" treatment is not only the surface treatment referred to in general interior decoration, but also how to organically combine this "three-sided" treatment with the overall environmental atmosphere design, because the indoor environmental atmosphere design is a whole, and the spatial effect and environmental atmosphere caused by "three-sided" are mutually influenced, that is, there are technical factors and aesthetic factors. "Three-sided" decoration is mainly surface treatment, including the use of materials, technical treatment and decoration and beautification. Decoration and decoration should be a whole and inseparable, so the use of materials should be based on the needs of different environments, using the texture, texture effect, decoration techniques and technical treatment of materials to create the expected environmental atmosphere and complete the decoration task. When beautifying the indoor environment, it is an effective means to decorate the wall with murals, paintings, wall hangings, calligraphy, handicrafts and sculptures to increase the artistic atmosphere, artistic taste and artistic style of the indoor environment.