The theme of this poem is the description of natural scenery and the poet's thinking about life and life. Among them, "the moon sets and the cold fog rises" depicts the scenery at night, and the cold fog represents loneliness and tranquility. "Shen Sihao Tongchuan" expresses the poet's deep thinking and broad vision. This poem reflects the poet's inner world and emotional changes through the description of natural scenery, which makes people feel deep and endless thinking.