The　kinematic　and　dynamic　analysis　of　compliant　mechanisms　is　investigated　comprehensively　in　this　work.　Based　on　the　pseudo-rigid-body　model,　a　new　PR　model　is　proposed　to　simulate　both　the　lateral　and　axial　deformations　of　flexural　beams　in　compliant　mechanisms.　An　optimization　for　the　characteristic　factors　and　a　linear　regression　for　the　stiffness　coefficients　of　PR　pseudo-rigid-body　model　are　presented.　Compared　with　the　1R　and　2R　pseudo-rigid-body　model,　the　advantage　of　the　PR　model　is　well　illustrated.　The　dynamic　modeling　of　flexible　beams　in　compliant　mechanisms　is　then　developed　based　on　the　PR　pseudo-rigid-body　model.　The　dynamic　equation　of　a　PR　pseudo-rigid-body　dynamic　model　is　derived　and　the　dynamic　responses　are　then　presented.　The　kinematic　and　dynamic　analysis　of　a　compliant　slider-crank　mechanism　is　presented　by　the　1R,　2R　and　PR　model,　respectively.　The　effectiveness　of　pseudo-rigid-body　models　and　the　superiorities　of　the　PR　pseudo-rigid-body　model　and　PR　pseudo-rigid-body　dynamic　model　are　shown　clearly　in　the　numerical　example.