A major S&T event in the world refers to an S&T activity and its achievements with worldwide influence,including:1.A transformative breakthrough in fundamental scientific understanding,which gives rise to systematic S&T innovation,and multiple technological innovation clusters,such as the discovery of electromagnetic induction and the establishment of electromagnetic theory;2.Discovery of phenomena unexplainable by the existing theoretical system,like blackbody radiation discovery gave birth to quantum mechanics;3.A transformative technological breakthrough A major S & T event in the world refers to an S & T activity and its achievements with worldwide influence, including: 1. A transformative breakthrough in fundamental scientific understanding, which gives rise to systematic S & T innovation, and multiple technological innovation clusters, such as the discovery of of electromagnetic induction and the establishment of electromagnetic theory; 2. Discovery of unexplainable by the existing theoretical system, like blackbody radiation discovery gave birth to quantum mechanics; 3. A transformative technological breakthrough