A new bilingual teaching mode are explained based on the characteristics, difficulties and practice in large-class teaching of steel structure design principle course. Firstly expertise and design philosophy should be main body and language skill be carrier in the bilingual teaching orientation. Limit design approach is applied to bridge the classic mechanisms and steel design course as well as selection of teaching content based on the traditional teaching mode divided by the structural behavior levels. The combined teaching methods are also used in the different teaching contents and stages to improve the student’s learning quality. Multi-channel teaching quality evaluations are provided in the whole teaching process to get teaching and learning feedback timely .