The Forbidden City is known to the world as the top of the five largest royal palaces, but its ridge decoration on the cornice is easily overlooked due to the small size. Ridge decoration deeply reflects the essence of traditional Chinese culture, so the work aims to promote and innovate in the cornice ridge decoration of the Forbidden City in order to better inherit and carry forward the excellent traditional Chinese culture. The image gene extraction method was used to transform the three-dimensional ridge decoration sculpture into a planar display form starting from the image design of the cornice ridge decoration. At the same time, the pattern composition was systematically analyzed according to the historical allusions, development process, image and color gene information and then combined with its mythological background pattern to complete the planar innovative combination and reconstruction. A scheme of digital art interactive device centered on the reconstructed cornice ridge decoration image was considered and its suitable commercial place and application scheme were explored so as to complete the application and dissemination of cornice ridge decoration in digital art. Ridge decoration is the treasure of traditional Chinese culture, condensing China's national culture, ingenuity, beliefs, myths, etc. By analyzing the multiple possibilities of digital art presentation in the future and strengthening the immersive and interactive experience of digital art, new ideas are proposed for the digital presentation of traditional patterns, and the feasibility is verified.