The sacrificial anode cathodic protection system of steel pipe piles of a wharf in Yangshan port has been used for more than ten years.The sacrificial anode protection effect is evaluated and analyzed by measuring the protection potentials,detecting anti-corrosion effect of the sacrificial anode protection system，and calculating the survival service life of the anodes.The results show that steel pipe piles in Yangshan port phaseⅠproject have been protected effectively in past ten years,and the cathodic protection system is running well.The remaining sacrificial anode life could not meet design life requirements because of serious scouring due to rush water and large sediment concentration.