In this paper, we first analyze the current teaching scheme of computer network experiment and study its shortcomings, then propose a new teaching objective and content, which means that the main contents of computer network experiment course for computer specialty undergraduate should be protocol analysis, and the teaching objective should be understanding principle, feeling design idea, mastering knowledge. To overcome the shortcoming of pure protocol analysis, we propose a novel experiment scheme, which applies "inverted curriculum" method to protocol analysis. The practices show that the proposed schemes are favorable to stimulate the students' interesting and improve the teaching effect.