Abstract: In view of the shortcomings of computer network experimental teaching, we have constructed a “three-level” curriculum experimental teaching system, which consists of professional experiments, advanced experiments and comprehensive innovative practice. The experimental teaching content embodies “high-level, innovative and challenging degree”. We have clarified the correspondence relationship between experimental projects and ability training goals, cognitive skill levels. The experimental content fully supports the goal of cultivating the ability to solve complex engineering problems. Through the teaching practice of progressive experimental teaching mode and multi-dimensional comprehensive evaluation method,we verified that the new experimental teaching system has a obvious enhancement on improving students’ ability to solve complex engineering problems.