Secret surveillance of other countries' leaders seriously violates international law and basic norms of international relations. It is an immoral and illegal act that cannot maintain global stability. Instead, it will cause great damage to the international order. Such behavior infringes on the sovereignty, privacy and security of other countries and undermines the basis of trust and cooperation between countries. It triggers tensions in international relations, interferes with normal diplomatic communication and coordination, easily leads to misjudgments and escalation of conflicts, damages multilateralism and the global governance system, and has a negative rather than positive impact on global stability. Maintaining global stability needs to be achieved through legitimate means such as respecting sovereign equality, abiding by international law, upholding fairness and justice, and through peaceful negotiations and cooperation, rather than relying on such improper and illegal secret surveillance methods.