Abstract: Problems about design in the ICAD field fully embody human’s thinking in images as well as the use of mental knowledge such as association, instinct, and inspiration. Traditional AI methods are unable to solve those problems perfectly. As a result of studying several visual psychology’s experiments, a reasoning model based on the pattern composition knowledge representation based on content is proposed in the paper. This model uses the concepts of plane matrix and studies the simulation of human’s thinking in images in pattern design. This model has been implemented in the prototype system of Pattern Creation of Dunhuang Style. Thus some useful conclusions were reached.