Depression is a style of poetry creation. The so-called "deep" mainly refers to the profoundness of poetry content, while "melancholy" refers to the dignified and implicit content of poetry. In the gloomy poetic style, the author seems to have a thousand words in his chest, and then he ponders it repeatedly and erupts in his pen. The formation of melancholy style is closely related to the poet's experience, personality and ambition.