基于Ｓｍｉｔｈ预估技术和多变量线性系统解耦鲁棒理论，研究了多变量时滞系统鲁棒稳定性，得到在Ｓｍｉｔｈ预估严格匹配时闭环系统稳定，且摄动系统为鲁棒对角优势，则摄动系统为鲁棒稳定的一般性结论 Based on the Smith estimation technique and the multivariable linear system decoupling robust theory, the robust stability of multivariable time-delay systems is studied. The closed-loop system is stable and the perturbation system is robustly diagonal when the prediction of Smith is strictly matched , The perturbed system is a general conclusion of robust stability