Nowadays, the design of digital image processing technology is developing in the direction of art and personalisation. In line with this development trend, it is necessary to combine computer art design to complete the art design system. The aim of this paper is to study the design of an art design system based on image processing technology. The interactivity of art and image processing technology are analysed, and a synthetic image display algorithm is proposed for application in the art design system. The system development tools and the architecture of the system are presented. We conduct environmental art design experiments, and the experiments yield good results.