水彩创作中的色彩建构常停留在经验层面，难以形成可迁移的教学路径与稳定判断。实践中，主调游移、灰度失衡 与无序对比叠加，易使综合灰度体系破碎，导致空间层级松散与观看路径紊乱。本文以“色彩决策”为切入，构建由主调选 择至灰度统筹的逻辑链，结合作者同一色调体系下的作品进行对照分析，归纳灰度建构与纯度区间定位的共性规律，验证该 方法在稳定空间关系、统一色调与提升氛围可控性方面的有效性，为教学与创作提供可复现的决策路径。

Color construction in watercolor practice often remains at an experiential level, making it difficult to establish transferable teaching pathways and stable creative judgment. In practice, the drifting of the dominant tone, imbalance in value structure, and the accumulation of disordered contrasts can fragment the overall value system, leading to weakened spatial hierarchy and disoriented viewing paths.This study takes “color decision-making” as its entry point and constructs a logical chain from dominant tone selection to value coordination. Through comparative analysis of the author’s works within the same tonal system, it summarizes shared principles in value structuring and chroma range positioning. The effectiveness of this framework is verified in stabilizing spatial relationships, maintaining tonal unity, and enhancing atmospheric controllability, thereby providing a reproducible decision-making approach for both teaching and creative practice.