Focusing on the application of the color association teaching method in primary school Chinese writing instruction, this study analyzes the connotation, characteristics of color association and its intrinsic connection with writing ability, and clarifies the mechanism by which color association influences various components of writing ability. On this basis, the study constructs the implementation principles and teaching preparation system of the color association teaching method, and proposes specific application strategies from three dimensions: stimulating writing inspiration, enriching writing content, and optimizing writing expression. These strategies include organizing color observation activities, determining writing themes, guiding color-related detailed descriptions, expanding writing plots, accumulating and applying color vocabulary, and constructing rhetorical devices based on color association. Through the design of a systematic teaching path, this study helps students transform their color association ability into practical writing ability, providing practical support for addressing existing challenges in primary school Chinese writing instruction and improving teaching quality.