Abstract: Since his lifetime, Li Yu has been receiving both positive and negative critical judgements. The primary reason for this was Li Yu's extremely complicated personality that had multi-layered polar opposites. It was also closely related to critical approaches and attitude. To avoid polar opposites in the criticism of Li Yu, we should avoid bias and emotional judgements, and adhere to the principle of prioritizing historical examination over moral evaluation. We should also comprehensively examine Li Yu's profile in the light of the development of his personality. It is necessary to distinguish and investigate Li Yu's behavior, thoughts and writing in an unbiased way, without too much praise for his works or attack on his personal life, so as to push forward the study of Li Yu.  

Key words: Li Yu, polar opposit, critical approach, critical mentality, evaluation principle