1﹒ Change Yuefu poems into literati five-character poems;
2. Change to express others' feelings or summarize feelings and give priority to personal feelings;
3. In Cao Zhi's later works, he achieved a leap from "beauty" to "nostalgia" and from "creating feelings for literature" to "writing bitterness", which made the five-character poem a new carrier for literati to express their feelings, thus marking the arrival of the third period of Jian 'an poetry and also marking the five-character poem.
Cao Zhi has many innovations and developments in the art of poetry. Especially in the creation of five-character poems. First of all, most of the ancient poems in Han Yuefu are narrative, and it was not until Nineteen Ancient Poems that lyric elements occupied an important position in the works. Cao Zhi developed this trend, and organically combined lyric and narrative, so that the five-character poems can not only describe complex events, but also express tortuous psychological feelings, greatly enriching its artistic functions.
He has more than 90 poems, including more than 60 five-character poems. His poems not only embody the elegance of The Book of Songs, but also contain the profound and strange interest of The Songs of the South. It not only inherits the brushwork of reflecting reality in Han Yuefu, but also retains the warm and sad artistic conception of 19 ancient poems. Cao Zhi's poetry has its own distinctive and unique style, which has completed the transformation from Yuefu folk songs to literati poems.