During the last years of Kapgan Kagan, many of the Turkic tribes left Göktürk union and settled around Taiyuan region. They became political actors as Bilge Kagan ascended the Göktürk throne. After gathering most of them by the end of the year 720, Göktürk armies started their expeditions on Tang territory. Few weeks later in 721, the Kang Dai-bin Rebellion took place and it was succeeded by his kinsman Kang Yuan-zi in 722 who addressed himself as a "khagan". In 722, Tang capital Chang'an was also shocked with Liang Quanshan's claim for the throne. That year, garrisons were established around Chang'an City and foreign delegations including Göktürk envoys came to China one after another. During this turmoil, in the first month of the year of 721, Tang Xuanzong decided to establish a new capital called zhongdu "the central capital" in Pujin, located on the southeast bend of the Yellow River. In the midst of rebellions and tribal conflicts, the decision of establishing a new capital was soon cancelled for Pujin being "not defendable" However, regardless of the "central capital" status of Pujin, a grand bridge construction started, using hundreds of tons of iron and stone. Pujin Bridge, one leg to the east of the river, the second one 360 meters to the east, on a sand dune in the middle of the river, and the third leg to the west of the Yellow River. With the statues' unique structure and the craftsmanship of the iron bridge could be the most remarkable symbols of Turkic presence in China. In this study, three poems were examined.