"Vertical pen" refers to the handwriting written or drawn by Emperor Qianlong himself, which is a kind of imperial pen. Imperial pen is usually a special pen used by the emperor to issue imperial edicts, read out the memorial and identify cultural relics. "Shu" means "goodness, beauty and kindness" in Manchu, so "Shu Bi" can be understood as a beautiful pen written by the emperor himself.

In the Qing Dynasty, the emperor's calligraphy art was highly valued. As a talented literati emperor, Emperor Qianlong had profound calligraphy attainments. He often writes or paints in person to convey his thoughts and feelings, and at the same time show his cultural accomplishment and artistic talent.

Generally speaking, the "vertical pen" of Qianlong imperial pen is an important object representing the authority of the emperor and culture and art, and it has extremely high historical and cultural value.