In view of the shortcomings of that it is difficult to calculate the initial position of switched reluctance motor in the inertial state, an initial position estimation strategy based on pulse injection method is proposed in this paper. The initial position of the motor can be obtained in both static state and inertia state when the strategy is adopted. Firstly, the selection principle of pulse current excitation time and injection frequency is analyzed, so that the switches and other devices can operate normally in a safe working environment. Then, the feasibility of experimental operation can be guaranteed. Secondly, the pulse injection method is used to implement the average inductance partition of the switched reluctance motor, and the position positioning of the motor at rest and with inertial speed is studied respectively. Finally, the experiment is carried out on a three-phase 6 / 4 switched reluctance motor. The experimental results show that the method can effectively measure the initial position of the motor in the inertial state or static state without adding additional hardware circuits. At the same time, the control algorithm is simple, easy to operate, and has strong universality and portability.