Abstract: In order to solve the problem that base-isolated LNG storage tanks may suffer pipeline rupture and tank overturning due to excessive isolator displacements under near-fault earthquakes, an innovative isolation device composed of a friction pendulum bearings (FPB) and U-shape dampers was proposed. A quasi-static test was performed to analyze the mechanical properties of the isolation device. A parametric analysis was conducted on them based on a validated FE model. The seismic mitigation effect of the isolation devices on a 160 000 m³ LNG storage tank was analyzed, and an objective function was defined to compare the performance of different isolation devices. Results show that the mechanical properties of the dampers are mainly controlled by the plate thickness, and the horizontal stiffness and yield force of the dampers increase with the increase of plate widths and thicknesses. For the typical 160 000 m³ LNG storage tank, it is recommended to adopt the FPB-1.2 bearings equipped with LY160-30 dampers, FPB-3.0 bearings equipped with Q345-30 or LY160-40 dampers, and FPB-6.0 equipped with Q345-30 dampers.