With the booming development of Viet Nam's economy, the demand for energy such as petroleum is growing dramatically, and the vertical storage tanks are the most important energy storagefacilities, and their demand is also growing. As a facility for storing flammable and explosive materials, once damage occurs, it not only causes directly serious disasters such as fires, but also causes other disasters such as environmental pollutions. Therefore, it is of great practical value to conduct seismic research on liquid storage tanks. Under strong earthquakes, liquid sloshing in the liquid storage tank will adversely affect the tank structure. In order to solve such problems, an annular baffle device can be installed in the liquid storage tank to control the liquid sloshing response. In order to investigate the influence of the baffle plate position and size in the liquid storage tank on the liquid sloshing response, this study is based on the large general finite element software ADINA. Assuming that the liquid is a viscous and incompressible fluid, the baffle is shaped as a thin circular plate and perpendicular to the tank wall, and establish a foundation-tankliquid interaction system. Firstly, the static and modal analysis of the liquid storage tank system without baffle plate is carried out and then the results are compared with the results of relevantcriterions. Moreover, the parametric analysis of the liquid sloshing response in the baffled tank under horizontal seismic excitation is carried out thoroughly. Keywords: Baffle plate; liquid storage tank; sloshing response; seismic excitation.