The early Tang Dynasty was a period of traditional transformation of Tang poetry. On the one hand, out of the need to polish Hongye, with the emperor's initiative and participation, some court poets, such as Yu Shinan during the Taizong period, Shangguan Yi during the Gaozong period, Shen Quanqi and Song Zhi during the Empress Wu period, all created a large number of palace poems. Inherited and continued the gorgeous poetic style since Qi and Liang Dynasties. They made historical contributions to the shaping of the five-seven-character rhymed poetry. On the other hand, some middle- and lower-class literati emerged one after another and launched an attack on the dominance of court literati. Their representatives were the "Four Heroes" in the early Tang Dynasty: Wang Bo, Yang Jiong, Lu Zhaolin, Luo Binwang and Chen Zi'ang. They consciously criticized the writing style of the Six Dynasties, consciously expanded the content of poetry, and created new styles. The Four Masters criticized the "Shangguan style" as "all the bones are gone and the strength is not strong", and advocated "removing its shortcomings" (Yang Jiong's "Preface to the Collection of Wang Bo").