Analysis of the role of the moon in the structure of the whole poem: (1) Among the five kinds of scenery: spring, river, flowers, moon and night, the moon is the center. The moon plays a key role in the relationship between scenery writing, lyricism and philosophy. Look at the moon and think about it. (2) The whole poem structure is arranged in chronological order. The whole poem is started with the clues of the rising of the bright moon (born in the tide), the moon reaching the sky (the bright moon is a solitary wheel in the sky), the moon moving westward (the poor moon wandering upstairs) and the moon setting westward in the western hills (the slanting moon hides the sea fog).