By investigating into the damage forms of container cranes in Han Shin Earthquake, it is concluded that the horizontal seismic force perpendicular to the rail is the main reason for the damage. Based on the theory of seismic isolation, a new type of anti-seismic device, composed of eccentric double slewing rings, Belleville spring, oil damper and shear pin, is designed for the container crane. A finite element model is established to numerically analyze acceleration response time history, inspired by Iran seismic wave, etc. in the method of Newmark-β. The numerical simulation result showes that, when the device functioned, the acceleration response peak value of the crane evidently decreases. The response at the top of crane frame is reduced by 45％, compared with that if the device is un-triggered. Furthermore, a seismic miniature test model, inspired by the same seismic wave, is designed according to similarity principle withd imensional analysis method. The results of test indicate that acceleration resp onse can be reduced to 10％ at most, besides the displacement is also substanti ally reduced. The results of numerical simulation and model test prove with each other, that the anti-seismic device is a reasonable design and the effect of seismic isolation is significant.