The intensification of international strategic competition has led to a shifting focus towards cyber security and the national defense industry.Countries now view defense industry cybersecurity as crucial in determining the outcome of war,emphasizing the need to secure the defense industry supply chain to ensure the generation and maintenance of combat capabilities,and readiness for crisis and conflict at any time.Western countries are concerned about risks in non-secret networks of contractors at the end of the defense industry supply chain,security certification of small and medium-sized enterprises,lack of technical support and financial support,and cyber threat information sharing.Consequently,countries are actively enhancing cyber resilience within the defense industry through measures such as sharing cyber threat information,formulating cyber security standard requirements,reporting cyber security incidents,and supporting cyber research and development cooperation.The foreign defense industry network security situation demands heightened attention and vigilance.