C. Debussy, who transferred impressions of nature to music in the most of the works, was not only object to period of romantic music’s expression and style but also try to new manner of expression. Until his period, he found restrictive to basic principle in ongoing music and adopted the first impacts, which he tried to shape the new manner of music, from impressionist painting and symbolist poem. C.Debussy, who took the piano the center of his composition, tried to discover the spectrum of tone’s colour, consequently he arrived the point where his desired. In this research, which has been not only informed to the style of impressionism and symbolism, but also examined to the style which was brought by C. Debussy, who started the new period in 20th. Century, in the terms of rhythm, melody, tone and harmony.