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PID controllers are one of the most applicable controllers in different industries. The main important need in application of these controllers is their parameters tuning in order to gain desired result. Existing tuning rules for their design are usually based on trial and error which are so time consuming, not accurate and have considerable error. In this paper, an accessible method with high accuracy and speed has been presented for determination of these control parameters, using PSO optimization algorithm and performance assessment criteria. The results show that there is a considerable difference between this method's results and the other method's.