Dynamics of flat blade stirred bed reactors was studied. The everage axial velocity and the axial dispersion coefficient were obtained by the pulse response technique and were correlated using such variables as rotating speed of blade （RPM）, slope of reactor(θ), feed rate (FR), air velocity(U_a) and the reactor diameter (D). The dispersion model was found satisfactory and a single parameter D·δ was found to play an important role for the correlations.