Investigating typical diseases of the piled wharf and considering the requirement of repair technology under marine environment,6 combinations of repair technology are proposed for the decision-making optimization of the repair technology for the coastal piled wharf.The efficiency values are obtained according to the construction time,cost and guaranteed time to help making decision of the maintenance scheme.Combining the case of one wharf in Huizhou,the maintenance effect and economics of different combinations of repair technology are analyzed to verify the correctness of the maintenance scheme which is made on the basis of efficiency values.