阐述了钻爆法隧道开挖时超欠挖产生的原因，分析了超欠挖对隧道施工成本的提高产生的重要影响，以此期望能够引起足够重视。最后提出控制隧道超欠挖的三条主要途径：①强化现场施工管理，这是减少超欠挖的根本措施；②实施“新奥法”技术，这是减少超、欠挖的有效技术措施；③改变“宁超勿欠”的传统观点，树立“少超少欠”的观点。

 The article expatiates on the causes for the overbreak/shortbreak in the drill+blast tunneling and analyzes on the impact of the overbreak/shortbreak on the increase of the tunnel construction cost. Finally, the article recommends three main approaches for the control of the overbreak/shortbreak during tunneling, i.e., ① strengthening the site construction management, which is the fundamental approach to reduce the overbreak/shortbreak; ② fulfilling NATM technology, which is the effective technical approach to reduce the overbreak/shortbreak; ③ replacing the traditional viewpoint of “overbreak rather than shortbreak” by the viewpoint of “less overbreak and less shortbreak”.