Claude Achille Debussy (1862-1918) was an important composer in the French Impressionist period. His style was characterized by hazy and graceful harmony. Because his life background was influenced by the Impressionist painters and Symbolist poets at that time, Debussy was Gradually develop his own style in creation. This article will use Debussy’s life and musical background, and then go into Debussy’s related works in depth, such as piano and orchestral works, as well as the influence of the contemporary background on Debussy, and then focus on Debussy as the main focus of this article. Taking the first volume of the piano work "Image" as an example, we further analyze how Debussy used special harmony and composition techniques in his piano music.

This article is divided into six chapters. The first chapter is the introduction, which will describe the research methods and research motivations. The second chapter is the process from realism to impressionism, explaining the origin of Impressionism and how it was influenced. The third chapter is the process from realism to impressionism. Chapters describe Debussy's background discussion and introduction to his works. Chapter 4 is about the characteristics of Debussy's piano works, analyzing the characteristics of Debussy's piano works and illustrating them with musical examples. Chapter 5 is about " The music in the first volume of "Image" is used for analysis and interpretation. Chapter 6 is a summary of personal views and the above content as the conclusion of this paper.