Production internship is a bridge for civil engineering students from theoretical study to engineering practice. The traditional production practice mode generally have problems such as low efficiency and poor results. Based on new media methods this research studies the principles, implementation and effects of refined management and evaluation through production internship teaching cases, analyzes the pros and cons through survey feedback and proposes improvements to the new mode. The refined mode enriches the teaching content and improves the teaching quality. The formed ideas and methods can provide a reference for the management and evaluation modes of other professional courses. It is also useful for exploring the refined management mode evaluation mode and evaluation standards in the virtual teaching process.