To analyze the feasibility of turbulent drag-reducing technique, and explore the relationship between drag reduction and solution temperature, concentration and flow Reynolds number and the characteristics of resisting the shear, cetyltrimethyl ammonium chloride (CTAC) aqueous solution have been investigated experimentally in this paper. The experimental results show that CTAC aqueous solution has strong ability of resisting the shear, and the drag-reducing effect of CTAC aqueous solution disappears when the solution temperature reaches 70 ℃. The experimental results will provide the important reference value and instruction meaning for the application of CTAC aqueous solution in a district heating／cooling (DHC) system, especially in the radiant floor heating (RFH) system.