The service environment of high pile wharf is complex,and the wharf structure will be damaged to varying degrees during the operation period of decades,affecting the safe operation of the wharf.During the operation of the wharf,the ship load is the main load of the high-pile wharf structure,which has a great impact on the safety and durability of the wharf structure.In this paper,the berthing capacity of a wharf in Nanjing Port is simulated by finite element method,and the three-level safety early warning threshold in the berthing process of ships is proposed.Combined with long-term online monitoring,it provides technical support for the safe service of the wharf structure.The results show that when the ship hits the 1# rack,the impact force of the ship reaches 238 kN,the wharf structure response reaches the third-level warning index,the wharf displacement is 3.8 mm,and the top strain of the pile foundation is 69×10-6.When the impact force of the ship reaches 323 kN,the wharf structure response reaches the second-level warning index,the wharf displacement is 5.1 mm,and the top of the pile foundation is 100×10-6.The impact force of the ship reaches 471 kN,the wharf structure response reaches the first-level warning index,the dock displacement is 7.5 mm,and the top of the pile foundation is 156×10-6.The online monitoring and early warning results show that the wharf structure has the berthing capacity of 5,000-ton ships,which can meet the structural safety requirements of 8,000-ton ships under the premise of standardized berthing.