A system of a rotating disk in a tank was devised to investigated the drag reduction phenomenon by the small amount of polymer additives. The optimum concentrations for the maximum torque reduction of about 24 % were determined to be 10 wppm and 40 wppm for polyethylene oxide and polyacrylamide solutions, respectively. These data were correlated in terms of power function and Reynolds number giving nearly the same slope at the maximum drag reduction. The extent of drag reduction in a rotating disk flow system was found to be relatively low in comparison to those reported for the pipe flow systems. The degradation of polymer solutions by high shear stress was also observed.