Abstract: In this paper a design method for performance enhancement of Hydraulic Turbine Regulating System is proposed. A multi-objective Ant Colony Optimization algorithm is implemented to the PID controller of Hydraulic Turbine Regulatory System(HTRS).Multi-objective controller design method is differ from single-objective optimization and it has more than one objective functions. In this paper ISE and ITSE are chosen as two objective functions. Objective is to achieve shortest rise time and minimum overshoot simultaneously.