The United States has been taking protective measures for integrated circuits used in key defense systems. Its military integrated circuit manufacturing capability mainly relies on the “Trusted foundry” project，and retains all the elements of its industrial chain in the country. The Ministry of National Defense designates the National Defense Microelectronics Center to carry out credible certification activities every year，and to manage all trusted OEM lines in three categories. The construction effect is remarkable，which ensures that advanced technology is “credible” and old technology is “available”. However，due to the unique source of advanced manufacturing capability for military integrated circuits，the U.S. Department of Defense is constantly developing new ways to deal with the crisis，so the “Trusted foundry” project is constantly changing，and will be paid more and more attention by the Department of Defense.