The M701F gas-turbine rotor system was taken as the study object,the dynamic model of the support-bearing rotor system was established.Considering the global variation range of dynamic parameters of flexible support-rotor system,a global matching analysis method was proposed and a numerical calculation software system for global optimal matching of dynamic parameters was implemented.By tracking and studying the change law of the best matching point and trajectory of the support dynamic parameters under the global dynamic parameters,the trajectory characteristics of the best matching point of the support parameters under different rotor dynamics parameters were revealed,and the global stability area and the non-uniformity stable area and application value were analyzed.The results show that the best matching support parameters and the best matching trajectory are always found within the range of global dynamic parameters,which provides a theoretical reference for the design of the best matching domain for stiffness and damping of flexible base-rotor system.