Abstract: In this paper,the anti-fouling experiment of green compound scale inhibitor PASP/POCA for heat transfer enhancement is conducted in the dynamic system.The result indicates that the performance of scale inhibiting of the compound scale inhibitor is very excellent.Little compound scale inhibitor into the solution can make fouling thermal resistance decrease extraordinarily,and the scale inhibition rate can reach to about 98%.SEM photographs show that the shape of CaCO₃ crystle changes from the compact structure to the relax structure,thus,scale is not easy to form on heat transfer surface.