This dissertation aims to illustrate and explore the planning and design of "postmodern" interior spaces, concentrating on the use and traces of postmodernism in interior design. This dissertation is important to study the direction of the historical development of art space, which reflects the future development of this industry to a certain extent. This report investigates three renowned designers and their work, namely the Mother's House designed by Robert Venturi, the Eat Darling Eat designed by NCDA, and the Sydney Opera House designed by Jorn Utzon. Postmodernism is different from the basic laws and order of architecture laid down since the Industrial Age. It defies the formalities of spatial design but with more irregular geometry, rich colors, and a blended integrated environment. Design is a mirror that always shows the avant-garde and progressive views of society; At the same time, it reveals the deepest reflection, the most urgent dilemma. Truth is not a purely rational existence, and concepts are constantly being subverted. With the rapid changes in society and the gradual narrowing of the world, the design direction of the future construction industry must be more and more diversified.