This paper analyzes the reasons why "wild goose" is a common poetic image in China's ancient poems and its cultural connotation.

Hongyan symbolizes homesickness, sadness, loneliness, letters and news. Hongyan is a large migratory bird, which moves southward every autumn, often causing homesickness and sadness for wanderers. Xue Daoheng, a native of the Sui Dynasty, wrote, "It's only seven days since I entered the spring, and I've been away from home for two years. After people return to geese, they think about flowers. " I had the idea of going home long before the flowers bloomed. But when the geese returned to the north, people had not returned home. When the poet was an official in the Northern Dynasties, he sent envoys to the Southern Dynasties and wrote this homesick poem, which was subtle and tactful. There are also letters referred to by Hongyan. The story of Hongyan is familiar to everyone. According to Hanshu, Xiongnu Khan lied to the Han envoy, saying that Su Wu was dead. The Han envoy deliberately said that the son of heaven shot down a swan goose flying from the north when hunting, and it was written by Su Wu. Khan had to let Su Wu go. Later, we used "swan goose", "goose book", "goose foot" and "fish goose" to refer to letters and news. The image of Hongyan is often associated with homesickness and letters, which is the result of long-term cultural accumulation.