Tunnel engineering is the core course in civil engineering. Based on the characteristics and teaching purposes of tunnel engineering course, the existing problems in traditional education were analyzed. On the basis of CDIO engineering education concept, thoughts of tunnel engineering teaching reform are presented, specific measures for teaching reform are put forward as well. Through the CDIO teaching reform, the goal of teaching ability is highlighted, the teaching contents are updated, the ability of independent, teamwork and communication for students are improved by the CDIO course project. It is proved that the quality of teaching has achieved good results. The teaching reform of tunnel engineering can provide good guide and reference for education reform and practice of civil engineering.