Abstract: What is the nature of beauty is the key point of discipline of aesthetics. An important reason of being argument about this issue is that because most of people ignore the difference of two aspects: the human beings as a subject of category-humankind-exist and a subject of sole individualistic exist. When people ask what is the essence of beauty, they mean there is a potential humankind-subject as an actor of aesthetic activity or the creature of aesthetic value. For only when there is a category subject, the value of beauty or ugliness should exist. However, people always to discuss this question from the angle of individual-subject. Nonetheless, the two aspects, category-humankind subject and individual or personal subject, should be distinguished clearly. They are two aspects or layers. Of course, they are related each other. The prior is the base of the later. To consider from the category-humankind subject, the essence of beauty is the “humanization of nature” and a kind of “free form”. To consider from the individualistic subject, it is a kind of union of subject-object emotional realm-image.