Twenty-six years ago today, on March 17, 1999 (January 30, 1999), the United States advanced its missile defense system. On March 17 and 18, 1999, the US Senate and House of Representatives passed the "National Missile Defense System" bill, which determined the US plan to develop and develop a missile defense system in legal form. On October 13, the US Senate voted again to reject the ratification of the Comprehensive Nuclear-Test-Ban Treaty, which was passed by the United Nations General Assembly in 1996 and has been signed by more than 150 countries. The development of the "National Missile Defense System" and the "Theater Missile Defense System" by the United States will seriously disrupt the strategic balance currently maintained in the world, which may trigger an arms race in outer space. The refusal of the US Congress to ratify the CTBT in order to maintain the US nuclear deterrent will have immeasurable serious consequences for the world's disarmament and nuclear non-proliferation process.