Abstract: This paper presents a computer-aided design method for linear time-invarient system compensation in frequency domain. It can be applied to the compensation for control systems containing different origin poles (Types O--2), real zeros, real poles and complex poles. Lead, lag, and lead-lag compensations under given performance requirement can be achieved. The design result of the compensated parameters can be printed by the computer. It can also print the time response curves and performance for both the original systems and the compensated systems through computerized analysis, if necessary. Satisfactory results were obtained in many practical cases.