Jian 'an poetry circle is a stage in the literary history of China where five-character poems flourished and seven-character poems laid the foundation. There were many writers and rich poems in this period, which set off the climax of literati's poetry creation for the first time in the history of China's poetry, and formed a style of the times called Jian 'an Style.
Five-character poetry is one of the genres of ancient poetry, which refers to a poem with five words in each sentence and five words in the whole poem.