Spring silkworm symbolizes hardworking, dedicated and intelligent people, and it is also a persistent, loyal and silent spirit. In poetry and literary works, it is also used to describe teachers and other people who are willing to contribute. There is the earliest record of "Spring Silkworm" in The Book of Songs. The most famous personification metaphor of "Spring Silkworm" is the poem "Spring Silkworm Till Death, Candle Tears Forever" written by Li Shangyin, a great poet in the Tang Dynasty. This poem has brought the perseverance, firmness and dedication of Spring Silkworm to the extreme, and has become a beautiful sentence sung through the ages.