"Bo Yuan Tie" is a letter written by Wang Xun, a famous calligrapher in the Eastern Jin Dynasty. It is on paper and running script, with 47 characters in 5 lines, 25.1cm in length and 17.2cm in width. Now in the Palace Museum, Beijing. "Bo Yuan Tie", Wang Xizhi's "Kuai Xue Shi Qing Tie" and Wang Xianzhi's "Mid-Autumn Tie" are collectively known as the "Three Treasures".