A software based on master-slave DSPs is presented to satisfy the real-time and self-tracking requirements of the seeker. As the slave DSP, ADSP2187N receives external inputs, and forms signal for aim detecting. Based on the signal, the master DSP TMS320C6414 implements aim detecting, identifying and tracking. The serial load program achieves auto-loading of seeker software, and provides way for further software update. In semi-physical simulation, the seeker tracks and hits the target correctly. Results verify the correctness of the software and show the achievements for the requirements of the system.