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反应系数法是空调动态负荷计算的常用方法，但用基于经典控制理论的传统方法求解多层墙体反应系数时可能发生漏根现象．文中基于Ｒｏｕｔｈ稳定性理论提出一种模型降阶方法，避免了求根，保留了原模型的渐近稳定性和低频特性，实例计算效果很好．
The response coefficient method is a common method for calculating the dynamic load of air-conditioners. However, the root-draining phenomenon may occur when solving the multi-layer wall reaction coefficients using traditional methods based on classical control theory. This paper proposes a model reduction method based on Routh stability theory, which avoids root finding and preserves the asymptotic stability and low-frequency characteristics of the original model. The example calculation effect is very good.