|The purpose of this paper is to explain the horizontal structure of Prelude, Op. 74, No. 4 by Skryabin objectively and logically by utilizing transformational networks to analyze the voice leading of this music. David Lewin explained transformational relations in musical space through a visual graph called a network and introduced a frame of analysis which simplified complicated aspects of music. There were other methods that analyse horizontal voice leading in atonal music by means of Lewin`s transformational theory. Of these methods, Henry Klumpenhouwer`s ``transformational networks`` and Shougn J. O`Donnell`s ``dual transformation`` have been adopted as a primary analytical method for this article. The network of Prelude, Op. 74, No. 4 by Skryabin is composed of eleven types of set classes, made up of transposition transformation. The network has verified the similarity between pitch classes by utilizing isography, which shows its pitch-class contents. In this article, I hope to show that atonal music composition has a delicate structure.