The basis of intelligent control of contactor is mostly realized by DC control and high-frequency PWM control. In order to further optimize the control algorithm for problems such as bounce and contact arc, parameter identification of electromagnetic mechanism is essential, and parameter mismatch directly affects the control accuracy of the algorithm. Based on the control rate accelerator CLA (Control Law Accelerator) module of digital signal processor DSP chip TMS320F28069, the parameters of electromagnetic mechanism controlled by intelligent closed-loop control algorithm of contactor are identified in real time, which greatly reduces the calculation burden of the chip under high frequency control. The identification results are output through SPI protocol and DAC module, which verifies the effectiveness of the parameter identification system.