The first is about or related to the major events at that time. Specifically, Du Fu's poems refer to what he saw, heard and felt when he made trouble in Lushan and moved to Longshu. This is different from the general reflection of reality. Because the Anshi Rebellion was the key to the decline of the Tang Dynasty. Du Fu's colorful descriptions of various social scenes in this historical turning point make his poems have the significance of profoundly reflecting the law of social development. For example, Du Fu's poems such as "Three Officials and Three Farewells" and "From Beijing to Fengxian, reciting 500 words".
Secondly, Du Fu exposed sharp social contradictions and disparity between the rich and the poor in his poems. The belligerence of Xuanzong in Tianbao period not only seriously damaged production, but also greatly intensified the exploitation of farmers. For example, Du Fu vividly reflected the hardships and hardships of people's life during the war in "Car Shop".
The third is the profound understanding of the ideas embodied in the works. "History of Poetry" not only means that the subject matter written in the work involves major social events, but also means that it has a more positive ideological education effect on society. This point is also very prominent in Du Fu's poems written around the Anshi Rebellion. His poems record social unrest in detail. His poems can be regarded as history, which can be proved and supplemented, so it is called "the history of poetry".
Du Fu lived under the rule of three emperors, namely Xuanzong, Tang Suzong and Tang Daizong, and it was also a turbulent period from prosperity to decline in the Tang Dynasty. Du Fu's realistic poems reflect the history and broad social life of the era in which he lived. They are like a history, reflecting the social turmoil brought about by social life in the Tang Dynasty, especially the Anshi rebellion, which is recorded in his poems in great detail. His poetry is a true record of social life in this period, with high historical value. It can be regarded as history, which can prove history and make up history, so it is called "the history of poetry".