The purpose of this article is to introduce and discuss the application method of Midjourney as an innovative interface design auxiliary tool. By analyzing the current development status of interface design and AI-Generated Content, comparing mainstream AI design software, the Midjourney tool is selected to compare with the traditional interface design process. The method of AIGC to assist the interface design process is proposed and at the same time, systematically analyze the types of interface design elements, verify the application of this tool in actual interface design projects through actual cases and guide designers to better use Midjourney to improve work efficiency in specific scenarios or element types during the design process using digital technology. Starting from the advantages and disadvantages of Midjourney, it helps designers and software developers analyze the usage limitations and potential problems of this tool, so as to better provide directions for the optimization and upgrade of future versions.