To　study　the　seismic　responses　of　a　continuous　beam　bridge　with　safe-belt　devices,　theoretical　formulas　were　derived　(i.e.,　natural　period,　beam-end　displacement,　shear　force　at　the　bottom　of　the　fixed　pier).　The　effectiveness　of　these　formulas　was　then　verified　by　comparing　the　theoretical　results　with　finite　element　results.　Finally,　the　influence　of　the　continuous　beam　bridge＇s　total　lateral　stiffness　and　of　the　safe-belt　device＇s　installation　position　on　the　aseismic　rates　was　analyzed.　The　results　showed　that　the　simplified　model　of　a　continuous　beam　bridge　with　safe-belt　devices　is　effective,　and　the　proposed　theoretical　formulas　can　be　used　for　the　seismic　design　of　this　type　of　bridges.　The　total　lateral　stiffness　of　continuous　beam　bridges　and　the　installation　position　of　the　safe-belt　device　have　both　a　great　influence　on　the　aseismic　rates,　which　should　be　optimized　to　obtain　a　good　aseismic　effect.　When　the　stiffness　ratio　is　greater　than　7.0　and　safe-belt　devices　are　installed　on　the　top　of　all　sliding　piers　in　continuous　bridges,　safe-belt　devices　have　a　good　aseismic　effect.　Furthermore,　the　natural　period　of　continuous　beam　bridges　with　safe-belt　devices　should　not　be　similar　to　the　characteristic　period　of　the　response　spectrum　after　the　activation　of　the　safe-belts.