In this paper conventional PID controller provides satisfactory results, still inefficiency persists due to extreme non-linear nature and uncertainty in the dynamics of the plant. So optimize the pidnon linear behavior by Gravitational search algorithm and partical swarm optimization. The PID controller is the most common form of feedback. PID control isused at the lowest level; the multivariable controller gives the set points to the controllers at the lower level. The PID controller can thus be saidto be the “bread and butter’ of control engineering. It is an importantcomponent in every control engineer’s tool box.PIDcontrollers have survived many changes in technology, from mechanicsand pneumatics to microprocessors via electronic tubes, transistors,integrated circuits.