Using　perturbation　theory　with　the　assumption　that　the　pulsatile　blood　flow　in　an　axisymmetrical　stiff　tube　is　the　first-order　term　to　solve　the　linear　equations　of　continuity,　motion　and　heat　conduction,　the　equations　of　the　pulsatile　flow,　including　temperature,　are　derived,　and　the　instantaneous　radial　distribution　of　temperature,　pressure　and　velocities　for　one　frequency　component　are　obtained.　Using　the　published　geometrical　and　physiological　parameters　of　a　large　artery,　a　numerical　analysis　of　the　distribution　relationship　between　the　axial　velocity　and　temperature　is　carried　out.　The　primary　studies　show　that　the　amplitude　of　temperature　fluctuation　in　the　tube　is　inversely　proportional　to　the　pulsatile　frequency,　the　temperature　and　velocities　gradients　are　mainly　restricted　in　the　near-wall　layers　with　the　increase　of　pulsatile　frequency,　and　there　is　a　close　similarity　of　the　radial　pulsating　distribution　between　temperature　and　axial　velocity,　which　indicates　that　the　blood　flux　in　the　artery　as　well　as　the　motion　function　of　heart　can　be　indirectly　described　by　the　measurement　of　temperature　fluctuation.