Du Fu is a poet who cares about the security of the country and the suffering of the people. In turbulent times and personal ups and downs, once you feel them, you will be filled with sadness. There is a kind of deep sorrow in his poems. Whether he is describing the sufferings of the people, missing friends and homesickness, or writing about his own poverty and depression, his feelings are deep and broad. His poems contain a kind of accumulated emotional power. Whenever he wants to burst out, his benevolent heart and his neutral attitude towards life formed by his Confucian cultivation suppress the sadness that is about to burst out. , making it slow, deep, and low and undulating. Personal grief turned into deep concern for the suffering of the people, leaving an endless lasting appeal. Melancholy and frustration are the main styles of Du's poetry. Depression is the intensity and depth of emotional sadness; frustration is the ups and downs and repeated dips in emotional expression.