Total system losses of the power system relate to the reactive power management in the network. This paper presents a method to minimize the system losses by utilizing Reactive Power Planning (RPP) approach. In this technique, the control variables of RPP were formulated as an optimization problem and Multiagent Immune Evolutionary Programming (MAIEP) was engaged to determine the optimal solution of these variables. In order to evaluate the effectiveness of the proposed technique, the total system losses during pre optimization was compared with the system losses during post optimization at IEEE 30 bus system. The results revealed that the proposed technique has the merit in addressing the above problem.