Abstract: P-class current transformer（CT） is widely used in 330 k V and below power system, but due to the poor transient performance, a large amount of residual flux is retained in the CT core. With the increase of short-circuit level of power system, the current transformer is more saturated,resulting in maloperation of relay protection connected to it.Therefore, a fast suppression method of CT residual flux for automatic reclosing was proposed in this paper. The method was realized by a residual flux suppression circuit connected to the CT secondary side, and the magnetic flux of core was gradually reduced by controlling the polarity of switch module output voltage. Furthermore, the selection methods of reversal times of switch module output voltage, DC voltage, and current limiting resistance in residual flux suppression circuit were also given in this paper. Finally, the typical current transformer parameters and their dynamic simulation experimental data during automatic reclosing were used for simulation tests under different residual flux polarity and different short circuit current. The results show that the proposed residual flux suppression method and its suppression circuit are feasible, fast,and superior in performance.