The bridge structure is seriously damaged due to strong motion earthquake, and the irregular curved bridge is response more obvious. According to the above, a new seismic system of the irregular curved bridge-floating seismic system has been proposed and the basic concept was elaborated at first. Secondly, the basic mechanical model of the system was established and dynamic equation of the system was derived. Finally, a 1/20 scale curved bridge model with floating seismic system was been built and the shaking table test was conducted with different seismic waves. The results show that, peak acceleration at the top of the pier decreased to some extent compared with the top of pier after the bearings sliding, the maximum reduction rate was 65%. During the test, the relative displacement of pier beam was larger, so the design of the anti fall beam device should be focused on. After the test, there was no serious damages such as beam falling and collapse. It indicates that the seismic performance of the floating seismic system was satisfactony and it could be used for designing curved bridges in high seismic intensity areas.