Yan Zhenqing was born in the third year of Jinglong in Tang Zhongzong (AD 709)-the first year of Zhenyuan in Tang Dezong (AD 785), at the age of 77. This word is clear. Regular script is dignified and dignified, and the momentum is open. Running script is relaxed and energetic. Duke Lu is a great figure in the history of books. Its official books are famous for their great strength, such as Bo Houxiong's "invincible front, ruined swords and stunned momentum", represented by Yan Jia Temple Monument. As for everyone on the cliff, they are magnificent, especially in the Tang Dynasty. At the highest level, those who show the spirit of rushing far away will push Li's memorial tablet. The grass is strong, beautiful and full of ancient meaning, and the manuscript of offering sacrifices to nephews is the first.