The rhetorical device of the third remnant of Yuanmingyuan is metaphor. In this poem, the poet compares the ruins of Yuanmingyuan to incomplete bamboo slips through metaphor, and compares the original splendid Yuanmingyuan to a beautiful article. This metaphor uses vivid language, shows the great contrast between the present situation of Yuanmingyuan and the past through comparison, and emphasizes the regret of being destroyed and the resentment against the invaders. Metaphor makes poetry more infectious and expressive, and makes readers feel more deeply the poet's grief over the destruction of Yuanmingyuan and the treasures of national cultural heritage.