Abstract: In a previous investigation in 1963 Wang and Shen et al found that the well known flow equation for pulsed sieve plate column given by J.D.Thornton should be modified and written as Vd/x+Vc/(1-x)=Vo(1-x)n.n=2.2±0.2 was obtained for kerosene-water system in a standard sieve plate column of 1 inch in diameter. This paper is a continuation of the previous works. Four kinds of liq-liq system were used in this study. The parameters n and Vo, the sauter mean diameter of dispersed droplets (D3,2) are correlated in terms of physical properties of the systems and operation variables:These correlations are Flooding velocities calculated by equations obtained are close to experimental values with deviation within(+)15%