This report has been focused on the studies of the hydraulic pressure distribution which is created by the agitation of the both liquids, dialysing solution and solvent, on either side of the dialysis membrane surface. Agitators of the both liquids have been investigated and developed which can counterbalance the hydraulic pressures. The effects of the agitation velocities on the dialysing velocity have been studied under the conditions which allow the uniform dialysis on the whole surface of the dialysis membrane. Each agitation velocity of the dialysing solution and solvent, at which the dialysis coefficient is obtained most precisely, has been determined.