In order to dispel Liu Bei's suspicion, he gave a banquet to cook wine with green plums. After drinking the wine, he saw a dragon hanging in the sky. Cao Cao used the topic to play, with the title "The dragon can be big or small, can be raised or hidden", which has profound implications. This is also a pun, which not only implies the respective situation of Cao Liu at that time, but also shows that Cao Cao is good at politics and wily. He laughed at Yuan Shu as a "buried bone" and claimed that he would be captured alive sooner or later, which gave him a sense of pride. He laughed at Yuan Shao's "bullying, being afraid of hard work and being resourceful." Do great things and cherish your body, and see that Xiaoli forgets her life "; He laughed that Liu Biao was a "hollow name"; He laughed at Liu Ce, but in the name of his father; He laughed that Liu Zhang was a "watchdog"; For Liu Beiju's Zhang Xiu, Zhang Lu and Han Sui, he even "clapped his hands and laughed" and said contemptuously that they were "mediocre little people, so why bother?" Cao Cao denied them one by one, which made Liu Bei somewhat overwhelmed. This is a temporary victory of Cao Cao's heroism and treachery. His analysis of those characters is really incisive; His refutation of Liu Bei's examples one by one really shows his great power, far-reaching strategy, extraordinary demeanor and clear attitude. Liu Bei was at the end of the road and refused to be topless. He simply "sued the hero" and took the opportunity to observe whether Liu Bei had the courage to fight for the hero who could compete with him in the future, which really surprised Liu Bei. However, his treachery was finally defeated by Liu Bei's wit, and the mystery disappeared. He thought he was more magnanimous than Xiang Yu and seemed to have no intention of murdering Liu Bei, so when Guan Yu and Zhang Fei came to the rescue, he ordered his men to "frighten Fan Kuai". It can be seen that his "wisdom" is limited. These words and deeds show that he is ambitious and good at playing politics. However, in the end, he failed to defeat the witty Liu Bei, and finally ended in Cao's failure. Liu Bei's "compromise" made him get rid of the shackles of Cao Cao and seek opportunities for development, which eventually became the trend of "three pillars". If Liu Bei had not been like this at that time, he would have been defeated by Cao Cao when he was weak.