Messiaen's Préludes, although an early work, is already unique and personal in its compositional style. This paper will commence with Messiaen's early life, touching on Debussy's influence on him, while exploring his early creative approach in order to understand the Préludes’ creative background and structure of each piece in analysis. Further, from Messiaen’s own comments on these Préludes, the paper investigates the link between musical form and the poetic titles of the Préludes, the integration of tonality and the modes, as well as the exploration of innovative sonority to be performed.