Abstract-In the fast-paced modern life where high efficiency is pursued, projection technology is not only applicable to temporary conferences and workshops for technology and network center, but is also connected with the computer and multimedia. Thus, projection technology is a large-screen image equipment projection technology that is widely applied. An intelligent projection system with the function of background color auto-adjustment was constructed. In the present paper, the intelligent projection system was combined with multimedia teaching of Landscape Design. Application results show that the image shown on the multimedia large screen by the projection display system is clearer than common multimedia, and the color effect is more vivid. Thus, this projection display system improves the teaching quality of Landscape Design, including exhibition, appreciation, communication, and examination, and enhances the teaching effect and the students' learning ability.