In order to reveal the effects of polyacrylamide(PAM)on pipeline spiral flows, an experimental facility of pipeline system and a revolving device consisted of a multi-guide vane were built. The hydrostatic pressure near the pipe wall and the dynamic pressure inside the probes in the pipeline spiral flow containing PAM were measured by a 5-hole spherical head probe and a piezometer tube, respectively. The velocity distribution, the capacity of mass transport, and the pressure characteristics of the pipeline spiral flow were analyzed. The experimental results show that the velocity distribution of the pipeline spiral flow is slightly different from that of clear water after the addition of a small quantity of PAM(100 mg/L), and the generation-development process of the pipeline spiral flow is extended by 67%. Besides, the mass transport capacity of the pipeline spiral flow is increased by 79. 1%~91. 5%, and the loss of pipeline drag force is reduced by 18. 0%~23. 8%.