Ideological and political education in courses is a key measure to implement the fundamental task of fostering virtue through education. As a core course for computer-related majors, “Computer Communication and Networks” has both technical and ideological characteristics, and is an important carrier for integrating ideological and political education. Aiming at the current problems in the integration of ideological and political education into this course, such as “emphasizing technology over value” and “rigid integration and lack of practice”, combined with the experience of teaching reform practice, this paper explores the implementation path of ideological and political education under the blended teaching mode (integration of online and offline, combination of theory and practice). By exploring the ideological and political elements in the core knowledge points of the course, constructing a dual-mainline teaching system of “technology impartment + value guidance”, designing teaching links of “online ideological and political infiltration + offline practical practice”, and supporting ideological and political teaching cases, practical tasks and evaluation systems, the in-depth integration of ideological and political education and professional teaching is realized. Practice shows that this teaching reform has effectively improved students’ professional literacy, network security awareness and feelings of family and country, solved the pain points of “difficulty in landing and poor effect” of ideological and political integration, and provided replicable and promotable practical experience for the reform of ideological and political education in similar engineering courses.