Abstract: This paper applies a staged method to the dynamic response analysis of liquid-filled tank under earthquake. A finite element model of liquid-filled tank is set up. Taking into account earthquake effect leads to additional load to the coupling equations. A cylindrical liquid-filled tank is studied using the model. It is found that the response of structures to the earthquake loading is much different from that of fluid. The advantage of the staged method is also verified. It is shown that the staged method is more efficient and cost-effective than the whole solution method.