The rapid development of network attack and defense technologies has posed various challenges to current cybersecurity assurance systems. Therefore, studying a new cybersecurity assurance system has become an urgent need to promote the development of information technologies and is of strategic significance for strengthening the network security and availability in China. This study summarizes the operation status of and major security challenges faced by China's current cybersecurity guarantee system that features a self-defense mode. A cybersecurity guarantee system based on a guard mode and its key technical tasks are proposed. Specifically, the tasks include honey point technology based on deep threat perception, honey court technology based on attack observation and discrimination, honey matrix technology based on collaborative linkage, and honey hole technology based on attack deterrence and mapping. Furthermore, we propose the following suggestions: (1) exploring the cybersecurity assurance mechanisms based on the guard mode to comprehensively improving the cybersecurity protection level of China; (2) exploring the research and application of security protection technologies based on the guard mode and achieving the integration of existing and new security protection technologies; (3) exploring a new talent-training model to cultivate innovative and practical professionals in the cybersecurity field.