Bai Juyi was appointed as the assassin of Hangzhou in July of the second year of Changqing (822 AD), and as the assassin of Suzhou in March of the first year of Baoli (825 AD). Therefore, this poem "Spring Journey to Qiantang Lake" should have been written in the spring of the third or fourth year of Changqing. This poem is selected from Volume 20 of "Bai's Changqing Collection". Written in the third year of Changqing's reign (823), it is a seven-character rhymed poem.