A new system was developed to mix viscoelastic fluid. To prevent fluid from creeping up the impeller shaft by the Weissenberg effect, the impeller was stopped, and the vessel was rotated, with periodic reversal of the direction of rotation. The impeller used was an anchor type that scraped the fluid from near the vessel wall. Viscoelastic fluid with the very large apparent viscosity of silicone rubber could be mixed efficiently with this system.