The research aims to explore the ethnic decorative pattern design method based on deep learning and evaluate its effectiveness in terms of creativity and practicality.This paper adopts a content-style decoupling network to achieve design image generation,which not only retains the content features of the original images,but also combines the rich style features of the style images.The results show that the ethnic decorative pattern design method based on the content-style decoupling network has achieved remarkable results in terms of creativity and practicality.