"Peony Pavilion"is Tang Xianzu's masterpiece,"portrait"as an important prop in the play,covering the meaning of self-portrait,substitute and personality expression of Du Li-niang.First,the portrait"serves as a thread that links the narrative of the play and drives the plot;secondly,the portrait"helps to read the characters in depth;moreover,the portrait"also helps to analyze Tang Xianzu's supreme sentiment.