Surfactant additives can reduce the turbulent drag during the transportation of fluids through a pipe. The drag-reducing effectiveness of several surfactants with different molecular structure were tested. Experimental data of drag reduction evaluation led to the following. The carbon-carbon double bond in a hydrophobic group of cat-ionic surfactant is effective to improve the drag reduction effectiveness in the lower temperature range. Introduction of a hydroxyethyl group into the hydrophilic part gives the same effect. The length of alkyl or alkylene group of a cationic surfactants is not the necessary uniform so as to give an effective drag reduction. A cationic surfactant with an ether group in a hydrophobic group is effective to change the strength of the micelles. Also, it is found that a non-ionic surfactant (some kind of amine oxide compound) can be the used as a good drag reducer without counter ion.