An　intensive　study　on　the　dynamic　modeling　and　analysis　of　compliant　mechanisms　is　presented　in　this　paper　based　on　the　pseudo-rigid-body　model.　The　pseudo-rigid-body　dynamic　model　with　single　degree-of-freedom　is　proposed　at　first　and　the　dynamic　equation　of　the　1R　pseudo-rigid-body　dynamic　model　for　a　flexural　beam　is　presented　briefly.　The　pseudo-rigid-body　dynamic　models　with　multi-degrees-of-freedom　are　then　derived　in　detail.　The　dynamic　equations　of　the　2R　pseudo-rigid-body　dynamic　model　and　3R　pseudo-rigid-body　dynamic　model　for　the　flexural　beams　are　obtained　using　Lagrange　equation.　Numerical　investigations　on　the　natural　frequencies　and　dynamic　responses　of　the　three　pseudo-rigid-body　dynamic　models　are　made.　The　effectiveness　and　superiority　of　the　pseudo-rigid-body　dynamic　model　has　been　shown　by　comparing　with　the　finite　element　analysis　method.　An　example　of　a　compliant　parallel-guiding　mechanism　is　presented　to　investigate　the　dynamic　behavior　of　the　mechanism　using　the　2R　pseudo-rigid-body　dynamic　model.