Aiming at the problem of the costs control of large-diameter bored cast-in-situ deep and long piles used in separate unloading-caps type of sheet pile wharf structure,this paper analyzes the optimizing of the pile length of large-diameter bored cast-in-situ deep and long piles in Tangshan Harbor Caofeidian Port Zone Comprehensive Bonded Area Generic Berth construction,with the experience of similar engineering practice in the vicinity of the construction site,the characteristics of wharf structure and construction technology of the bored pile,etc.The results show that the data of ultimate axial bearing capacity of a single pile from static loading test and factors in bored pile operations are applied to the optimizing of the pile length,which can reduce the project cost.