An　extraordinary　phenomenon　with　violent　oscillation,　accompanied　by　an　abnormal　＂click＂　sound　is　observed　during　the　valve　closing　in　a　fuel　feeding　pipe　system.　A　fluctuation　model　with　flow　cavitation,　in　which　time-varying　stiffness,　time-varying　damping　coefficients　and　flow　cavitation　are　comprehensively　considered,　is　proposed.　On　this　basis,　a　dynamic　vibration　equation　is　established　and　an　expression　of　flow　pressure　at　the　valve　port　is　derived.　The　critical　displacement　of　the　flow　cavitation　system　is　defined.　When　the　vibration　amplitude　reaches　the　critical　displacement,　cavitation　occurs.　Based　on　this　model,　simulation　of　vibration　displacement　and　flow　pressure　is　given.　The　simulated　transient　process　shows　the　phenomena　of　vibration　fluctuation　with　cavitation.　The　results　are　compared　with　the　experimental　data　measured　by　a　pressure　sensor.　Under　our　experimental　conditions,　the　critical　displacement　of　vibration　is　1.41　mm,　and　the　average　relative　pressure　peak　error　is　0.022.　The　comparison　between　the　simulation　and　experimental　results　shows　that　they　are　in　an　acceptable　agreement.