A　study　on　the　dynamic　modeling　and　performance　for　compliant　mechanisms　with　inflection　beams　is　presented.　Based　on　the　pseudo-rigid-body　model　(PRBM),　a　5R　Dynamic　PRBM　(5R　D-PRBM)　is　proposed　for　the　flexural　beams　with　inflection　points.　The　dynamic　equation　of　the　5R　D-PRBM　is　derived　using　Lagrangian　equation.　Numerical　investigations　on　the　dynamic　responses　of　the　flexural　beam　with　an　inflection　point　are　presented　by　the　5R　D-PRBM.　The　advantage　of　the　new　model　is　illustrated　comparing　with　ADAMS　simulation.　An　example　of　compliant　parallel-guiding　mechanism　is　presented　using　the　5R　D-PRBM.　(C)　2019　Elsevier　Ltd.　All　rights　reserved.