An argument method that vividly proves an argument by analogy is also called metaphorical proof. The metaphor is clever and reasonable. Because this method is vivid and easy to understand, it can concretize the abstract truth and become simple and vivid, thus strengthening the proof of the argument. When using, we should pay attention to the appropriate metaphor. Generally speaking, metaphor proof should not be used as an article.

Metaphorical argument. It is to use the metaphor of familiar things to demonstrate the correctness of the point of view. For example, "Whistle" uses the real thing in life-"whistle" to compare what many people pursue, and makes a wrong evaluation of its value. People paid too high a price for the whistle, thus demonstrating this argument. In this way, through metaphorical argumentation, the reason discussed is simple and thorough, the image is easy to understand and more convincing. For another example, the argument that "knowledge can improve human nature" in the fourth paragraph of On Knowledge is demonstrated by a set of metaphors: "Human nature is like wild flowers and weeds, and knowledge learning is like pruning and transplanting". For example, in the fourth paragraph of "Persuasion", "The crab kneels six times, and its son is caught. It's not that the snake point has no sustenance, and the heart is impetuous. " Writing in this way makes the argument easy to understand.

Metaphor argument is a method of argument, and metaphor is rhetoric. Figurative rhetoric in argumentative writing is a metaphorical argument.