Poetry usually limits the number of words in each sentence according to its format. China's earliest poems were structured with metrical poems, and the metrical requirements were strict. For example, the poems in the pre-Qin period are generally four words per sentence, which can be found in the Book of Songs. Later, it developed into a five-character or seven-character rhythmic poem, which was found in Tang poetry. After the further development of economy and culture in Song and Yuan Dynasties, the content of poetry gradually expanded and reached the later stage of the new-democratic revolution.
Poetry has evolved into a free poem that is not limited by the number of words. Poetry, also known as poetry, is a literary genre with certain rhythm and rhythm. It can vividly express the author's rich emotions and reflect social life with highly concise language according to certain format and metrical requirements. Poetry is the ancestor of literature and the root of art, and poetry is a literary genre that expounds the soul.
Poets, on the other hand, need to master mature artistic skills and express social life and human spiritual world with concise language, rich emotions and rich images according to certain requirements of syllables, tones and rhythms. Confucius believes that poetry has four functions: arousing, observing, gathering and telling. Lu Ji believes that "poetry is beautiful because of love."
In ancient China, unhappy people were called poems and happy people were called songs. In addition, The Book of Songs is also the original name of China's ancient literary work The Book of Songs (The Book of Songs began in the Western Han Dynasty).