In this paper, distributed parameter process systems behavior is studied in frequency domain. Based on the dominant gain concept that is developed for such studies, a method is presented to control distributed parameter process systems. By using dominant gain concept, the location of open loop zeros, resulted from the time delay parameter in the process model, were changed from the right half plane to the left half plane. This will result in improvement in the performance of the control loop since open loop behavior is changed from non-minimum phase to minimum phase characteristic. Actually, the dominant gain concept is introduced in the control loop as a dominant gain constraint by the use of a first order compensator in the control loop.