Creation background Liu Yuxi once wrote the number of words in “Remembering the South of the Yangtze River”, which was sung in harmony with Bai Juyi, so he said in the small preface: “He Yuetian Spring Ci is based on the song” Remembering the South of the Yangtze River “.” This word was written in Luoyang in the early summer of 837 AD (the second year of the founding of Emperor Wenzong of the Tang Dynasty), so it can be inferred that the three words written by Bai Juyi should also be written in the early summer of the second year of the founding of the Tang Dynasty.