Since B A Tom 's found out the drag reduction phenomena, which occurs in polymer solutions in1948 many studies, have been done for it because we can apply to the economizing energy system thephenomena. The drag reduction is the application of the turbulent modification of the flow and we canapply it for the turbulent flow region. We measured the turbulent pressure loss in the square ducts andcircular pipe flow of a guar gum solution by manometer, and found that the friction factor in the ductsflow ware expressed by Re. Pressure loss in ducts ware measured for various concentrations of guargum and various diameters of pipes in water to study the effect of the additive on drag reduction, It isfound that guar gum acts like other drag reduction polymer additives because it constant the frictionfactor in laminar regime, modify the transition to turbulent flow, and reduces the friction factor the fullyturbulent regime.