Since the 19th National Congress of the Communist Party of China, our country pays more and more attention to the strategy of building a strong traffic country, and the pace of innovation and development has accelerated. From the completion of Hong Kong-Zhuhai-Macao Bridge to the commencement of the whole line of Sichuan-Tibet Railway, the construction of bridges in China is facing various and unprecedented great challenges. From the completion of Yangsigang Yangtze River Bridge with a main span of 1 700 m to the commencement of Zhangjinggao Yangtze River Bridge with a main span of 2 300 m, the scale of long-span bridges in China is constantly breaking new records. In order to suit the requirement of important engineering, a composite training mode based on postgraduates is established to improve their abilities of the innovation and practical application, analyzing and solving problems, enhancing the quality and the efficiency simultaneously. Important parts are determined by the team leader, and specific research work is guided by the young teachers, fulfilling the directive role of the tutor team. Furthermore, the training mode based on “surface to line to point” focusing on the research method, comprehensive ability, and application innovation, is established, and the training program is specified gradually and adjusted dynamically. The practice shows that the composite training mode based on postgraduates improve their senses of participation and gain. Combined with the dynamic training mode based on “surface to line to point”, it is favorable to formulate research programs for different postgraduates, which can better inspire their subjective initiative and increase the achievements with higher quality. The postgraduate should first complete the task-type scientific research work, and then complete the dissertation autonomously. With the process, the personal comprehensive ability can be effectively improved, which is more suitable for the requirement of innovation in important engineering.