The linear relationship between transfer torque and exciting current of magnetic powder clutch easily achieves to the electronic control and are widely used on the passenger cars. This article established the drive circuit model based on the experiments of excitation current transfer torque for magnetic powder clutch. Aiming at the nonlinear problems of the drive circuit, the article designed a current controller of magnetic powder clutch, which used method of genetic algorithms tuning PID control parameter. The simulation results showed that the drive control dynamic based on the genetic algorithms tuning PID was better than the traditional PID control, and the system had better adaptability.