Abstract: In traditional high-frequency (HF) pulsating voltage injection method, the strategy combining a band-pass filter(BPF) and a low-pass filter(LPF) (BPF+LPF) is employed to extract the position error signal. However, the disadvantage of this strategy is that it cannot take into account both the filtering accuracy and dynamic performance of the position estimation closed-loop. In this paper, an improved position error signal extraction strategy based on dual-frequency notch filter(DFNF) cascading LPF (DFNF+LPF) was proposed. In the improved strategy, the bandwidth is extended by increasing the loop gain and the DFNF is employed to enhance the suppression of the 2^nd injected harmonics. So, the position estimation closed-loop features both high bandwidth and strong filtering. In this paper, the model of equivalent position estimation closed-loop was established and the amplitude- frequency characteristic of closed-loop transfer function was utilized to analyze the problems of the traditional position error signal extraction strategy, first. Then, the principle of the improved position error signal extraction strategy was presented and the performance of two strategies was compared. Finally, the position estimation performance of the two position error signal extraction strategies was compared based on a RT-LAB experiment platform.