What are the characteristics of poetry in the early Northern Song Dynasty?

In the early years of the Northern Song Dynasty, there were mainly three schools: Bai Style, Late Tang Style and Kunxi Style. Their common feature was that they inherited the Tang Style and did not form the unique style of the Song Dynasty, so they could be called the inheritance period. "White Style" mainly imitates Bai Juyi's shallow poetic style, but the result is often "easy to flow without deep warning" ("Si Ku Quan Shu Summary Riding the Province Collection"). The poet with high achievement is Wang Yucheng (954 ~ 100 1), who claims to be "based on lotte, dare to be beautiful" (Two Poems of Former Fu Village), so his poems are strongly realistic. "Late Tang Style" is represented by "Nine Monks". Jia Dao and Yao He, who preferred sons to daughters in the late Tang Dynasty, valued the peaceful artistic conception, but it was often fragmentary and small. "Kunxi Style" takes Li Shangyin as an example, pays attention to phrasing and advocating truth, and its representative writers are Yang Yi, Qian and so on. The Quincy School was strongly opposed by Fan Zhongyan, Shi Jie and others. Although Fan and Shi did not use the title of poems, they also created some works with different styles, which made a certain contribution to the origin of Song tune.