Halliday has made great contribution to the development of EST.The linguists' efforts on studying and developing EST evolved from the ever-accelerated progress of science and technology,and also from the scientists' concerns about languages and linguistics.Physics,being the core basic science,has a close relation with linguistics since long time ago.Whenever there was an epochal discovery in physics,the most famous names in the world of physics and linguistics tended to emerge in the same period.The academic exchanges and interactions between physicists and linguists are conducive to the development of both linguistics and physics.And the blossom of EST is a good example.