Numerous scholars have studied the Clavierübung III, but their studies mainly focused on the relationship between the chorale text and Bach♠s response in music. Analysis without explaining J.S. Bachs word painting in other chorale preludes can be found easily, but most analyses treat rhetoric, especially those dealing with Clavierübung III. There have been numerous studies linking Bach's organ works to Lutheran doctrine. However, to give a better understanding of the work's structure and its implications for performance, a contrapuntal analysis is indispensable. This study deals with an analysis focused on canonic and fugal techniques in selected large chorales, and it will provide a better understanding of Clavierbung III. For purposes of comparison with typical fugal techniques, the C minor fugue from the Well-Tempered Clavier I, BWV 847, is taken as a model. This work reveals typical eighteenth-century, late Baroque fugal structure with a well-defined subject. The episode modulates through the keys of Eb major-G minor and C minor. Below is an outline of the present paper. Chapter I discusses the purpose of this study. Chapter II covers the earlier research on Clavierübung III and includes a discussion of the general background of the Clavierübung III. Chapter III provides a contrapuntal analysis of the three chorale preludes. A translation of the text will be included in each analysis.Chapter IV, the conclusion, will summarize and confirm the findings from the present study of the analysis.