AbstractThe proportional-integral-derivative (PID) controller are widely applied with the electro-hydraulic servo system since it is easily to implement and highly efficient. The optimal tuning PID parameter that can increase the performance of the control system. Thus, this paper is considered the optimization technique of Genetic Algorithm (GA) for tuning PID controller parameter for electro-hydraulic servo system. The other techniques are compared, that is the obtained results are shown the genetic algorithm optimized PID controller provide an improved closed-loop are performed than the Ziegler- Nichols, tuning method automatic tuning method and particle swarm optimization (PSO).