To　construct　the　spatial　kinetic　equation　of　an　arterial　tube　and　obtain　its　radial　natural　frequency,　a　linear-elastic　and　small　deformation　condition　is　assumed.　The　theoretical　analysis　is　first　presented　and　the　finite　element　method　is　then　used　to　numerically　simulate　the　spatial　kinematics.　The　results　show　that　the　first-order　frequency　is　15.8　Hz　and　the　obtained　exact　analytical　solutions　agree　well　with　numerical　solutions,　which　proves　that　the　theoretical　analysis　and　numerical　simulation　are　both　correct.　©　2009　Higher　Education　Press　and　Springer-Verlag　GmbH.