This study is an investigation of tonal structures in selected preludes of Shostakovich's Op.34. Explanations and analytic perspectives provide support of tonality oriented interpretation for the compositions which often appear to be "atonal." Chapter One is divided into (1) historical perspectives of the prelude as form, and (2) Summary of Shostakovich's life and work. Chapter Two contains a historical background of (1) the development of Shostakovich's compositional styles, emphasizing his early style of piano composition, and (2) the impact of his "Lady Macbeth," the crisis and its influence on later works. Chapter Three deals with the problems of and analytical approaches in the study of the selected preludes.