Zi Jin is a poem in The Book of Songs, the first collection of poems in ancient China. This poem describes a woman who misses her sweetheart. They met on the rostrum, but they couldn't wait long. The woman is eager to see, complaining that her lover doesn't come to the appointment, and even more blaming him for not sending a message, so she sings the infinite emotion of "not seeing for a day, like March". This poem consists of three chapters, each with four sentences. It fully describes the psychological activities of female lovesickness in flashback, which is vivid and beautiful. This is a rare and beautiful love song, which has become a classic in the literary history of China.
Regarding the meaning and background of Zheng Feng's golden zither, Preface to Shi Mao said: "Zi Jin, if you stab the school, it will be abolished, but in troubled times, you will not repair it." Confucius' Ying Da Shu: "The state of Zheng declined and failed to repair the school, and scholars scattered, either going or staying, so those who stayed hated the words of those who left, so they abolished the school by stabbing. The three chapters are all Chen's words, who is responsible for going through the customs. " Zhu's Biography of Poems said: "This is also a dissolute poem." These views are crowded today. Modern scholars generally believe that this is a love song. The singer is madly in love with a young man. They met at the city gate, but they couldn't wait long. The singer was anxious to wear it and walked back and forth anxiously, so he sang this poem to express his feelings.