In the 22nd year of Kaiyuan (AD 734), Yan Zhenqing was promoted to imperial academy, and was appointed as an imperial envoy for four times to supervise the imperial envoy in the temple relocation. Rejected by Yang, the powerful minister at that time, he was demoted to the plain (now Lingxian County, Dezhou, Shandong Province) as the satrap, which was called "Yan Plain" in history. In the fourth year of Jianzhong (783), he was framed by Prime Minister Qilu and sent to Li Xilie as a traitor, and was killed by Li Xilie. He is honest, clean and honest, has a sense of justice, never condescends to the powerful, condescends to flatter, and is famous for his benevolence and righteousness.
Yan Zhenqing is a descendant of the Yan family in Langya, with a deep family background. Yan Shigu, the fifth ancestor, was a famous scholar in the Northern Qi Dynasty. He once wrote family instructions for the Yan family. When Yan Zhenqing was young, his family was poor and lacked paper and pens, so he used a pen to brush loess water to practice calligraphy on the wall. Chu Suiliang was a beginner, and later learned Zhang Xu's brushwork. He also absorbed the characteristics of the four schools in the early Tang Dynasty and accepted the brushwork of Zhuanli and the Northern Wei Dynasty. He completed the vigorous and broad creation of colorful regular script, which set a model for regular script in Tang Dynasty. His regular script is contrary to the calligraphy style of the early Tang Dynasty, featuring brushwork. It is a typical example of perfect combination of calligraphy beauty and personality beauty.