A comparative analysis between the B-21"Raider"and the B-2 stealth bombers is conducted on their development history and capabilities.The characteristics of B-21's technological performance,its digital engineering and open architecture applications,and contributions to the combat system are highlighted and inspirations are drawn there from.A new generation stealth strategic bomber developed by the United States Air Force for the post-2030 combat environment,the B-21 features strong combat capabilities,high survivability,and flexible weapon configurations.It will primarily undertake strategic nuclear strike and conventional precision strike missions,serving as the cornerstone of American future air-based strategic deterrence.