Electrorhelogical　fluids(ERF)　behave　excellent　anti-vibration　performance　based　on　the　controllable　damping　characteristic.　However,　it　is　difficult　to　establish　an　accurate　control　strategy　because　of　the　complexities　of　the　dynamics　of　ERF　under　different　vibration　amplitude,　vibration　frequency　and　different　electric　field　strength.　Through　the　testing　experiment　on　the　dynamic　performance　of　anti-vibration　structures　containing　electrorheological　fluids(ERF),　an　analysis　model　is　established　for　studying　the　dynamics　of　ERF　based　on　the　hysteresis　curves.　By　observing　the　hysteresis　curves　acquired　by　excitation　experiments,　the　dynamics　of　the　ERF　based　anti-vibration　device　can　be　analyzed.　According　to　the　analysis　results,　the　dynamics　of　ERF　are　classified　into　five　categories:　Newton　viscous　liquid,　pre-yield　elastic　body,　pre-yield　viscoelastic　body,　nonlinear　body　and　post-yield　viscous　body.　At　the　same　time,　the　occurrence　conditions　of　ERF　behaving　the　different　dynamics　and　influence　of　ERF　to　the　dynamics　of　the　global　structure　are　discussed.