1. Fact demonstration: Prove the argument with real, reliable and representative examples. Function: effectively prove the central argument, enhance the persuasiveness, interest and authority of the article, and make the article easy to understand.

2. Comparative argument: compare the positive and negative arguments or arguments, and prove the arguments in comparison. Function: Outstanding viewpoint and impressive.

3. Metaphorical argument: use familiar things as metaphors to prove the argument. Function: Vividly demonstrate the viewpoint and make the article easy to understand, easy to understand and accept.

4. Quote: Quote famous sayings, aphorisms, authoritative data, anecdotes of celebrities and jokes to demonstrate. Function: Citing anecdotes and anecdotes of celebrities can enhance the interest of the argument and attract readers.

5. Illustration: It is a method of citing conclusive, sufficient and representative examples to prove the argument. Because "facts speak louder than words", citing hard and typical facts to prove the argument can enhance the persuasiveness of the article.

6. Reasoning and argumentation: it is a method of citing authoritative remarks to prove arguments. Therefore, this method is used properly and has strong argumentation. To analyze the function of citation method, we must first find out whose speech is quoted and what to prove, and then grasp the special function of citation method-authority and power.