Proposes the method to realize no position detection for switched reluctance motor using BP neural network. It, with winding phase current and magnetic chains as input and rotor position as output, establishes non-linear mapping between phase current, magnetic chains and the rotor position. Simulation results show that this approach not only simplifies the complexity of the system and improves its detection accuracy, but also makes SRD with good dynamic characteristics, better self-adaptability and robustness.