The requirements for poetry writing in the Qin Dynasty were primarily governed by the political and cultural context of the time. Poets were expected to adhere to a strict form and content that reflected the ideals of the state. The most significant requirements included:

1. Form and Structure: Qin Dynasty poetry was predominantly in the form of the "shi" (詩), a traditional Chinese poetic form characterized by a fixed number of characters per line and a consistent rhyme scheme. The "shi" form was often used for both courtly and folk poetry.

2. Content: Poets were expected to write in a manner that promoted the state's interests, including loyalty to the emperor, the glorification of the state, and the propagation of Confucian values. Themes often included loyalty, bravery, and the natural world.

3. Language: The language used in poetry was to be clear and concise, avoiding overly complex or obscure terms. This was to ensure that the poetry was accessible to a wide audience, including the common people.

4. Rhythm and Sound: The rhythm and sound of the poetry were crucial, with a focus on harmony and balance. The use of alliteration and assonance was common to enhance the musicality of the poems.

The reasons for these requirements are rooted in the political and cultural climate of the Qin Dynasty. The first emperor, Qin Shi Huang, sought to centralize power and establish a unified state. Poetry was seen as a tool for reinforcing these ideals and promoting a sense of national identity. The following data supports this analysis:

The "Shi Jing" (Book of Songs), a collection of ancient Chinese poetry, includes works from the Shang and Zhou dynasties, which were predecessors to the Qin Dynasty. Many of these poems reflect the social and political conditions of the time, often emphasizing loyalty and the natural world.

The "Qin Shi Huang's Canon of Poetry" (Qin Shi Huang Shijing) was a collection of poems that were officially selected and promoted by the state. These poems were chosen for their adherence to the state's ideals and their ability to inspire loyalty and patriotism.

The Qin Dynasty's emphasis on Confucian values also influenced poetry writing. Confucianism placed a strong emphasis on loyalty, filial piety, and the moral conduct of individuals, which were often reflected in the poetry of the time.

In conclusion, the requirements for poetry writing in the Qin Dynasty were shaped by the political and cultural context of the time. Poets were expected to adhere to a strict form and content that promoted the state's interests and Confucian values. The focus on clear language, rhythm, and sound ensured that the poetry was accessible and could be used as a tool for state propaganda.