A portable reconnaissance radar servo system which one person can be easy to move in war field must be miniaturization and portability. A portable reconnaissance radar servo system has been introduced in this paper. The structure, hardware and the software design method of the servo system have been discussed. The miniaturized DC motor driving scheme with the pulse width modulation (PWM) has been proposed. The control model and the transfer function of the servo system have been established and simulated digitally by Matlab program language. The performance of the servo system has been verified through the simulation and experiment.