Rocking　structures　with　self-centering　capacity　can　control　the　damage　in　the　rocking　interface　to　protect　the　major　structure　from　damage.　To　investigate　the　seismic　response　of　a　rocking　double-column　bridge　system,　a　dynamic　analytical　model　of　rigid　bodies　was　used　to　predict　the　seismic　response　of　a　rocking　bridge　system　based　on　the　Lagrange　method　and　momentum　conservation　law.　This　analytical　model　was　used　to　perform　a　case　study　in　practice,　parametric　analysis　and　overturning　analysis.　It　can　be　concluded　that　the　rocking　double-column　bridge　system　with　dimensions　in　practice　can　satisfy　the　seismic　design　demand　of　the　E2　earthquake　according　to　the　seismic　design　code　of　bridges　in　China.　With　the　increase　of　the　slenderness　and　size　of　columns,　the　seismic　response　of　this　bridge　system　decreases.　Overturning　acceleration　spectra　and　two　overturning　modes　of　rocking　double-column　bridge　system　were　obtained　due　to　Ricker　wavelets.　The　transition　phenomenon　from　overturning　mode　I　to　overturning　mode　II　should　be　paid　attention　in　seismic　design.　The　enlarged　bottom　section　of　rocking　columns　was　proposed　to　limit　the　overturning　of　the　rocking　bridge　system.　©　2019,　Engineering　Mechanics　Press.　All　right　reserved.