Bai Juyi's allegorical poems, such as "New Yuefu" and "Qin Zhongyin", are different from Du Fu's realistic works in subject matter, expression technique and ideological depth.
First of all, Bai Juyi's satirical poems usually use the method of "fu" to directly state the facts, and then use metaphors and symbols to reveal the theme. For example, Sinuhong, Sinuhong's experience is used as a metaphor for the corruption of the imperial court.
Du Fu's realistic works, on the other hand, use "Bi Xing" to imply the theme through objects and scenery, such as the scene of spring in Spring Watch to imply the prosperity of the country.
Secondly, Bai Juyi's satirical poems often have deeper thoughts. He not only exposed and criticized all kinds of drawbacks in political and social life at that time, but also deeply discussed the roots and solutions of these problems. For example, in Qin Zhongyin, he profoundly exposed and criticized the corruption of officialdom and the suffering of the people.
Du Fu's realistic works are relatively conservative in ideological depth, and more emphasis is placed on worrying about the country and the people. For example, in Up the Mountain, he expressed his deep concern about people's suffering.
Finally, Bai Juyi's satirical poems focused more on the problems in political and social life at that time, such as corruption and people's livelihood sufferings, while Du Fu's realistic works covered a wider range of topics, involving countries, people, history, culture and other aspects.
For example, Bai Juyi's Xin Qiji is an allegorical poem, which exposes the corruption of the imperial court and criticizes the corruption of the imperial court and the darkness of officialdom by describing Xin Qiji's experience and behavior.
Du Fu's "Spring Watch" is a realistic work that implies the country's prosperity through the scene of spring, and expresses anxiety and concern for the country by depicting the scene and emotion of spring. These two poems are different in expression, depth of thought and theme, but they are both excellent realistic poems.