The literature of the Song Dynasty was known for its graceful and restrained Ci. Its Ci style was fresh and elegant, and it was implicit and euphemistic. It was known as the "Yi 'an Style" and had a far-reaching influence on later generations. Li Qingzhao, a writer of the Song Dynasty, became an important figure in the history of literature because of his outstanding literary achievements and unique artistic style. Her Ci works were mainly used to express female emotions and thoughts, and were known as the "peerless beauty in Ci". In addition to Li Qingzhao, there were also many outstanding writers in the Song Dynasty, such as Xin Qiji, Su Shi, Lu You, and so on. Their works were also highly regarded as classics in the history of literature.