The 21st century is an era of information technology, every citizen should master certain computer application ability, and understand the use of network technology. The school should introduce the research teaching when carrying out the computer network course, give full play to the subject of the students in the course, and let them explore the relevant content of the computer network course. Combining with the author’s own teaching experience, the research reform of computer network course based on the three-stage teaching model of "subject inquiry" is discussed, which is intended to play a certain reference function.