Head coverings and ornaments were symbols with which Tang rulers and other political actors constructed cultural identity,expressing their power and establishing new emperorminister relationships and a new political order.As such,they were closely related to changes in the political situation.From the Wude to the Zhenguan reign years of the early Tang,the pingtou xiaoyang,the huada’er headdress,the King of Wei headdress and the Duke of Zhao huntuo headdress were very popular.After Wu Zetian ascended the throne,the"Kings surnamed Wu "style came into use,reflecting her intention to elevate the position of all kings with the surname Wu above the whole court.This was also an important measure in her establishment of new emperor-minister relationships and a new political order.After Emperor Zhongzong was restored to the throne,he promoted the use of the "Prince of Ying Headdress" in the 4th year of Jinglong(A.D.710)as one of the measures to establish his authority in his later years and resume the rule of the house of Li over the country.From the middle and late Kaiyuan period,the emperor Xuanzong created a new head covering called changjiao luofutouin order to change the headgear of his powerful minister Zhangyue.To some extent,this reflected a political landscape in which the emperor’s power was being strengthened at ministers’expense.The shanzi junrongtou,which represented the power of the eunuchs,was one of the most popular headdresses in the middle and late Tang Dynasty.In short,the changing styles of headwear reflect the political evolution of the Tang Dynasty