Aiming at solving the problems of the existing mechanical on-load voltage regulation and power electronic automatic voltage regulators with complicated structure, lengthy switching process and slow response speed, a segmented fast voltage regulation model based on thyristors is proposed. The model removes redundant transitional circuits to reduce voltage regulation structure. Under the condition of ensuring that there is no short-term voltage and current interruption, it cooperates with the characteristics of high-frequency full-control thyristors, and uses fast switching thyristors and segmented windings to restrict the transitional circulation and simplify the regulation. The process can be switched at any time, which breaks the limit of zero-crossing switching theory. The influencing factors of the loop current are determined through the theoretical inference, and reasonable values of the influencing parameter are obtained based on the simulation experiment and the result analysis. The final parameters are used in the 10 kV/0.4 kV and 400 kVA transformer to be simulated by Matlab. The experiment has proved the feasibility, reliability and rapidity of the segmented model. This work is supported by National Natural Science Foundation of China (No. 51577050) and Science and Technology Project of Jiangsu Electric Power Company (No. J2017069).