The development of space nuclear systems by the United States is analyzed in terms of its inevitability and feasibility.The implications of the US space nuclear power strategy for other nations'space security,encompassing their capabilities,assets,interests,and military forces,are explored.Recommendations are proposed to facilitate decision-making aimed at effectively countering these space security challenges.These include initiating space nuclear power programmes,reinforcing protection for space equipment,developing a'trinity'framework for space advancement,and establishing international norms for space nuclear power.Recently,the United States has initiated a comprehensive strategy for space nuclear power and propulsion.This strategy emphasises the advanced development of space nuclear technology and the application of nuclear energy to supply heat,power,and propulsion to spacecraft.Such an initiative is likely to redefine the paradigms of future development and competitive models in space.This could significantly widen the capability gap between the United States and other major space-faring nations,even leading to a profound divide.