This paper describes the stylistic found in analysing a poem especially an assonance. This research applied qualitative method. To analyse the data, the writer used the content analysis approach, in which based on Wellek and Warren's theory about intrinsic and extrinsic aspects of literary works. The findings were collected from assonance found in William Shakespeare poem’ the Rape of the Lucrece. The writer concludes from this research more information to the people about the identified stylistic analysis (assonance) found in the poem that can show us its relationship among the poem itself and the background of the poem’s writing by the poet.