This article centers on "White Paintings", the early representative work of Robert Rauschenberg, a 20th-century American artist. Focusing on "white"—the core color carrier in the work—and combining the artist's life experience with the historical context of the transformation of Western art after World War II, it systematically analyzes the in-depth shaping of Zen thought on Rauschenberg's color choices, color expression logic, and color aesthetic concepts. By interpreting the Zen essence embodied in the color of "White Paintings", this paper reveals how Rauschenberg transformed Zen philosophy into a visual color expression through a monochromatic language. Furthermore, it explores the unique value of this Zen color aesthetics in the innovation of color language in Western modern art, providing an Eastern perspective for the study of color aesthetics in a crosscultural context.