Dynamic　effects　are　very　important　to　improving　the　design　of　compliant　mechanisms.　An　investigation　on　the　dynamic　characteristics　of　planar　compliant　parallel-guiding　mechanism　is　presented.　Based　on　the　pseudo-rigid-body　model,　the　dynamic　model　of　planar　compliant　parallel-guiding　mechanisms　is　developed　using　the　numerical　methods　at　first.　The　natural　frequency　is　then　calculated,　and　frequency　characteristics　of　this　mechanism　are　studied.　The　numerical　results　show　the　accuracy　of　the　proposed　method　for　dynamic　modeling　of　compliant　mechanisms,　and　the　relationships　between　the　natural　frequency　and　design　parameters　are　analyzed　clearly.　Copyright　©　2008　by　ASME.