"Le Yi Lun" is Wang Xizhi's regular script calligraphy, created in the fourth year of Yonghe (348). "Le Yi Lun" was written by Xia Houxuan during the Three Kingdoms period. It is an article discussing the battles of the famous Yan State general Le Yi during the Warring States Period. Wang Xizhi copied this calligraphy and paid it to his son Wang Xianzhi. The original traces have long since disappeared, but there are many engraved copies handed down, such as "Yuezhou Shishi Tie", "Yuyantang Tie", and "Kuaixuetang Tie".