The prestressed concrete double-T plates have been gradually popularized and used in industrial structures，but relevant experience summary on their designs is few. Based on the engineering practice of automated wharfs in Qinzhou 7# and 8# berths，this paper introduces some key issues regarding the design and application of double T plates in the maintenance shop of port engineering and matters needing attention during the construction. The results show that the variable cross-section slop and bearing types of double T plates have a great influence on the design of the lower structure. Therefore，it is necessary to pay attention to the design and recheck the reinforcement of supporting beams under double T plates. Furthermore，it is suggested that the Drawing Collection for National Building Standard Design add details of double T plates with a span of above 24 m，so as to make double T plates widely applied.