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Previous studies have theoretically demonstrated that international counter-terrorism cooperation can effectively combat terrorism and maintain regional stability and development. However, due to the limited availability of data, most studies lack empirical analysis. We employ differences-indifferences models to investigate whether the counter-terrorism cooperation actions of Shanghai Cooperation Organization can effectively inhibit the development of terrorism in member countries. We find that after the official launch of the Regional Anti-Terrorism Structure of Shanghai Cooperation Organization, the number of terrorist activities in member countries decreased by 59.8% compared to other Belt and Road countries, and the number of casualties caused by terrorist activities decreased by 42.7%. Mechanism tests show that the breeding ground for terrorism can be eradicated by improving political governance and promoting economic development in member countries. In the context of counter-terrorism, apart from the Shanghai Cooperation Organization, both the North Atlantic Treaty Organization and the European Union contribute to the reduction of terrorist attacks among their member states. We believe that by seeking international counter-terrorism cooperation based on common security interests, and actively utilizing a flexible and diverse range of counter-terrorism measures, we can curb the development of terrorism