In the basis of the integration of traditional and network teaching, a network teaching system based on webquest and mindmap was established. Around webquest and mindmap, the main modules of the system had been designed and a new inquiry teaching model had been established, in which the teacher-leading and student-centered idea was introduced and intellectual analysis feedback circle was designed. By inputting teaching tasks, teaching situation and teaching resources, and by means of teacher's just-in-time guidance and student's thinking and inquiry, the system could output the final complete mind maps and inquiry conclusions. The system was applied to the "principles of computer network" course and empirical research was carried out in the experimental class. The experimental results show that, the network teaching system can stimulate student's learning interest, and improve student's comprehensive qualities and innovation ability.