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A novel functional subcircuit model based on MATLAB/Simulink for high power circuit simulation is proposed in this paper. The model can overcome the limitation of PSPICE model in high power system and remedy the deficiency in transient analysis of the Simulink model in toolbox. It described the static and dynamic process of thyristor correctly in the simulation of a high power thyristor controlled reactor (TCR) system. A good practicality of the proposed model has been observed.