A novel parameters estimation strategy of interior permanent magnet synchronous machine (IPMSM) for accurate torque control is proposed and investigated in this paper. The difference of q-axis inductance and d-axis inductance is estimated by a PI regulator using the deviation between actual output power and reference power. The estimated difference of dq inductance can be used to achieve maximum torque per ampere control and accurate toque control. This strategy is most effective when IPMSM works under high-power high-speed working conditions. It provides an effective way for IPMSM accurate torque control. The effectiveness of the proposed method is verified by both simulation and experimental results.