The response specd of current loop of permanent magnet synchronous motor (PMSM) servo system determines the servo system response speed. The deadbeat current control allowed PMSM current control loop to have a good response speed. However, when the actual motor parameters did not match the motor parameters in the control algorithm, current steady error would be produced, and the desired torque could not be output. The discretetime integral was added to the deadbeat current control algorithm and the range of integral coefficients was given, which eliminated the current steady error caused by the change of motor parameters and the accuracy of current tracking was improved. Finally, the validity and practicability of the proposed algorithm were verified by experiments.