Narrative literature takes events, characters and environmental scenery in the objective world and the virtual world as the theme, takes imitation and fiction as the conception, and takes concrete and vivid narration as the main artistic expression, thus reflecting and expressing the aesthetic grasp of social life by the creative subject. Narration is the basic aesthetic feature of narrative literature. Narrative literature includes novels, epics, narrative poems, story poems, historical biography literature, reportage and so on.
Lyric literature is a literary work with the subjective feelings of the lyric hero as the center, inner feelings and experiences as the way of conception, and direct expression as the main artistic expression, thus showing the creative subject's perception and appreciation of nature, society and life. Lyricity is a prominent aesthetic feature of lyric literature. Lyric literature mainly includes lyric poetry, lyric prose and prose poetry.
Drama literature is a kind of literary work with the theme of contradictions and conflicts in life, the way of simulating and reproducing virtual reality, and the main artistic expression means of characters' own behaviors and lines, thus reflecting the aesthetic grasp of social life by the creative subject.
Trigonometry, that is, according to the way of shaping literary image and artistic expression, is divided into narrative, lyric and drama, that is, the classification method of poetry, novel and drama.
This method comes from the west, first seen in Aristotle's Poetics, and later developed into a relatively perfect theoretical system by Hegel and belinsky, which classifies literature according to its content.