Abstract: The failure of hardware and software in PMSM control systems may result in unpredictable error or loss of the initial value of rotor position, and will consequently lead to failure of control system. In order to solve the problems above, the influence of rotor position error on direct-axis voltage is analyzed, and a quadrature-axis flux linkage identification based zero-position correction method for position sensors is proposed. At first, the curve of q-axis flux linkage is obtained via an offline identification. And the curve fitting tool is used to obtain the function, thus the accurate d-axis voltage equation can be calculated. Afterwards, the influence of position error on the q-axis flux linkage and d-axis voltage equation is employed for the establishment of closed-loop adjustment system for rotor position error. Finally, the online zero-correction of position sensor is achieved. The proposed method is verified on the test platform, and the results show that the proposed method has good calibration accuracy and application reliability.