The service environment of high-pile terminals is complex，and the safety problem of structural displacement under variable loads such as ships and portal cranes is prominent.However，dynamic displacement monitoring is a challenge when high-pile terminals often do not have a reference frame and service is the norm in harsh offshore conditions.In this paper，the dynamic displacement monitoring technology without reference is used to monitor the real-time displacement of a high-pile terminal in Jiangsu.The displacement response law of the terminal under the condition of portal crane operation and ship impact is analyzed in detail，and a two-level early warning index of the terminal is proposed based on the applicability and safety of the terminal.Combined with numerical simulation calculation，the berthing suggestions of ships of different tonnage of the terminal are proposed.It is concluded that the operating position of the portal crane is a direct factor affecting the displacement response of the terminal.Under the influence of ship impact，the displacement response of A2 monitoring point is large in the X and Y directions due to the influence of boundary conditions such as approach bridges.The first-level early warning index is calculated from the maximum value of the main load action combination of the terminal，and the displacement response value is 15.39 mm；The secondary warning index is judged by the tensile limit stress value of concrete，and the displacement response value is 19.14 mm.The normal speed of 10,000-ton ships should not exceed 0.19 m/s when berthing，and the normal speed of 5,000-ton ships should not exceed 0.22 m/s when berthing.