Abstract: Zhang Yan, who wrote three kinds of works on Du Fu's poetry, was a famous expert in the study of Du Fu's poetry during the Jiajing period of the Ming Dynasty. Influenced by social atmosphere and poetic trend at that time, Original Meaning of Du Fu's Poetic Rhythm annotated Du Fu's 151 seven-character poems by taking Zhang Yan's Romance of Du Fu's Poetry in the Yuan Dynasty as original copy, and referring to Zhang Fu-jing's Interpretation of Du Fu’s Poetry in the Ming Dynasty. Although his annotation style followed the previous ones, its integrated chronology of Du Fu’s poetry and smooth poetic dredging have certain value and characteristics. Zhang Yan also supplemented and deleted the annotations of some same poems in Original Meaning of Du Fu's Poetic Rhythm and Analysis of Du Fu's Poetry, which makes Analysis of Du Fu's Poetry more perfect, and reveals Zhang Yan's academic attitude of striving for perfection.