In this work, the dynamic characteristics of a continuous-flow agitated tank, showing a lump-parameter system proporties were studied both experimentally and theoretically. In this research, the mathematical models of a continuous-flow agitated tank cooled by jacked were developed. This developed models were linearised and then solved with Laplace transform. The dynamic proporties of the continuous-flow agitated tank were investigated with the step change which was given to the input variables. In the first part of this research, for the case in which water was fed to the agitated tank, the dynamic proporties of the tank were investigated and also the best operating conditions for the experimental work were found.