In view of the shortcomings of computer network experimental teaching, a “three-level” curriculum experimental teaching system is constructed, which consists of professional experiments, advanced experiments and comprehensive innovative practice. The experimental teaching content embodies “high-level, innovative and challenging degree”. The experimental content fully supports the goal of cultivating students' ability to solve complex engineering problems. Through the teaching practice of progressive experimental teaching mode and multi-dimensional comprehensive evaluation method, it is verified that the new experimental teaching system has a obvious enhancement on improving students’ ability to solve complex engineering problems.