Based on the practical sea wharf structures upgrading and reforming cases,this paper classifies wharf structures into two categories depending on whether the wharf apron is advancing or not.In condition of fixing wharf apron,we present three practical reforming cases:reform of rubble bed,addition of independent structure ahead of foundation and addition of accessory structures.In condition of advancing wharf apron,two cases are presented:newly constructed structure combined with old structure or newly constructed structure independent to the old one.For the open type wharf on piles with fixed wharf apron,the cases of separated structure and combined structure are presented.