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In the 19th century, based on classical mechanics, new disciplines such as optics, thermodynamics, electromagnetism, and astrophysics have made great progress, forming a classical physics system. Classical physics has advanced human understanding of nature to an unprecedented depth and breadth. 2. The crisis of classical physics-the background of the emergence of relativity and quantum theory (1) Absoluteization of classical physics: At that time, classical physics represented by Newtonian mechanics was regarded as an absolutely authoritative theory, and all natural phenomena were considered It can be illustrated with classical physics. (2) New discoveries in physics: New discoveries in physics (physical phenomena in high-speed motion, movement of microscopic particles) cannot be parsed with classical physics, and there is a sharp contradiction with the theoretical system of classical physics, revealing The limitations of classical physics. This requires a radical change in physics.