Art pattern composition knowledge representation is the basis of the intelli gence of computer-aided art pattern design．Computational imagery is a simulation of the human mental image．The paper describes an art pattern composition knowledge represen tation scheme based on computational imagery．It includes the deep representation，visual representation and spatial representation，and the operations of these three representations．It represents the art pattern layout'S subshapes’visual shape and spatial relation to consititute the representation of the layout，contains their abstract and image information．