This　paper　investigates　the　observer-based　sampled-data　control　problem　for　networked　systems　with　consecutive　packet　dropouts.　A　new　consecutive　packet　dropout　model　is　established　to　describe　the　phenomenon　of　packet　dropout　in　both　the　sensor-controller　(S-C)　and　controller-actuator　(C-A)　channels.　First,　the　considered　system　with　observer-based　control　scheme　is　studied　in　the　discrete-time　domain　by　using　equivalent　discretization　transformation.　In　order　to　simplify　subsequent　analysis,　matrix　exponential　computation　is　employed　to　transform　the　discrete-time　system　into　a　more　tractable　form.　Then,　the　proposed　new　consecutive　packet　dropout　model　is　taken　into　consideration　to　establish　the　stochastic　mean　square　exponential　stability　condition.　Furthermore,　a　novel　two-step　synthesis　approach　is　used　to　design　the　observer-based　controller.　Finally,　the　effectiveness　of　the　proposed　observer-based　sampled-data　control　approach　is　verified　using　a　numerical　example.　In　addition,　the　advantages　of　the　proposed　approach　are　validated　through　comparisons.