Occam's razor or Ockham's razor was first proposed by William of Occam, a logician from Occam. The law is usually expressed as: "entities must not be multiplied beyond necessity." In popular words, it means "don't waste more things to do things that can be done with less things."

This law is similar to the principle of simplicity in scientific research, and has become the basis for judging the scientificity of theory. If researchers use as few assumptions and simple logic structure as possible in the process of establishing the theory, and get a concise formula, then the probability can ensure the scientificity of the theory. In addition, when two competing theoretical models with the same conclusion are judged to be more reliable, according to the law, the model with simpler form or structure will win. For example, Copernicus noticed that geocentrism needed more assumptions than heliocentrism to get the same result, so he preferred the latter. This process of choice is just the process of "razor" to play its role and simplify.

Objective things are the unity of opposites between complexity and simplicity. The phenomenon is complicated and fleeting, and the essence is deeply embedded and stable. Complexity is the wonder of the world, while simplicity is the spirit of the universe; Simplicity is the root of complexity. The change and evolution of objective things are governed by universal principles (such as the principle of conservation of energy and the principle of minimum energy consumption) which have been discovered by human beings; In addition, there are usually few parameters controlling its evolution. Therefore, the evolution of its essence may be described by a concise theoretical model. However, there are still a lot of parameters that affect the evolution of things. Although these parameters do not play a dominant role, they can play the role of "seasoning", leading to the complexity of things in the process of evolution, which poses a great challenge to researchers. Even so, no matter how cunning the fox is, it can't compete with a good hunter. As long as the researchers are good at grasping the essence through the phenomenon, look at it with broad vision and deep insight, and study it with the attitude of seeking knowledge from things, they will finally be able to see the sun through the clouds.

Newton [3] thought: "nature does not do useless things, because nature likes simplification, and does not like to boast about itself with any superfluous reasons." Lord Niu, this is true! Our research on the mechanism and regularity of earthquakes in the past ten years shows that although the phenomena of earthquakes are ever-changing, they are still inseparable from each other.

Okam's razor law not only provides a guide for researchers to judge the scientificity of theoretical results, but also reduces unnecessary disputes on existing theories. In addition, the law can also be used as one of the criteria to judge the value of scientific researchers' achievements [5]. If a scientific researcher can clarify a representative innovation achievement in a very short time (such as two minutes), and make most of his peers understand it and stand up to his doubts, it usually means that the achievement is really good.