For the bearing capacity of ship reception chamber under earthquake，we study the coupling dynamic response of chamber-water-ship. Based on the ANSYS software，we establish a finite element model of ship reception chamber by the modified Housner theory to simulate the coupling action between ship and water，compare and analyze the dynamic responses of the system under three conditions including ship reception chamber at the bottom，middle and top. The results show that under the same earthquake condition，when the position of the ship reception chamber changes from bottom to top，the maximum stress，lateral and longitudinal acceleration all increase accordingly. The maximum lateral and longitudinal displacement and acceleration at the top are 263.31 mm and 0.174 mm，3371.97 mm/s2 and 1.47 mm/s2 respectively，and the maximum equivalent stress is 52.76 MPa.In the design of ship reception chamber，the working condition of ship reception chamber at the top can be taken as the design basis.