Time to the late Ming Dynasty, because thoughts have been influenced by decadence of the neo-Confucianism over a long period of time, the society was full of hypocrisy, and people's minds were long-term lack of the nourishment in "emotion". The "advocating emotion" thought in the late Ming was born to fight against it. And Tang Xianzu (1550-1616) is considered as a header of integrating "emotion" into literary theory, playwriting and life practice. The academia always think that Tang is the representative of "advocating emotion thought" in the late Ming. His theory is not only based on "emotion", but also emphasizes the claim of "struggle against reason with emotion". It is indeed self-evident that "emotion" is lifelong belief of Tang, and even the basis of creation, the core of theory, etc. However, from the core point of view in this article, the author thinks that Tang's concept of emotion not only emphasizes its significance, but pay more attention to the analysis of emotion's meaning. Therefore, this essay will discuss the general situation in contemporary understanding of "emotion", and further clarify the standpoint of Tang's concept of "emotion"