"Depressed and frustrated" was originally a word used by Du Fu to comment on Yang Xiong's and Gao Mei's Ci and Fu in "Into the Carving and Fu Table", and later it was called the style and characteristics of Du Fu's poetry. What is "depression and frustration"? Wu Zhantai, a Qing man, said: "People who are depressed are also interested; Those who are frustrated, the law is also. " It is generally believed that the so-called "depression" mainly refers to the profound content, bold artistic conception and deep feelings of poetry; The so-called "frustration" mainly refers to the ups and downs of poetry expression, the ups and downs of tone and emotion. Depression is related to the main artistic conception of the work, and depression is related to the performance skills of the work.