Mozart’s piano sonatas are essential for all pianists. His keyboard works which are influenced by Baroque music not only reflect the trends of the time but also show the composer’s unique style. This dissertation will focus on the first movements of his piano sonatas. The author, as a performer, will further discuss the performance practice and interpretation of Mozart’s music and make attempts to depict Mozart both subjectively and objectively. The main discussion of the interpretation will be the author’s own notion of the timbre and thus hopefully can be inspiring for performance and teaching.