In　order　to　study　the　properties　of　needled　C/SiC　composite　under　random　vibration　loading,　a　kind　of　plate　specimen　with　arc　notch　was　designed.　Random　vibration　tests　were　carried　out　on　a　vibration　table,　the　vi-bration　fatigue　life　and　vibration　response　signal　at　the　dangerous　position　of　each　specimen　were　obtained.　The　strain　amplitude　probability　distribution　of　vibration　response　signal　was　obtained　by　rainflow　counting　method,　which　can　be　approximately　described　by　the　Dirlik　distribution.　The　attenuation　history　curve　of　natural　fre-quency　for　the　specimen　presented　obvious　nonlinearity.　In　addition,　the　microscopic　fracture　morphology　of　failed　specimens　showed　that　the　major　failure　mode　of　fibers　in　axial　and　transverse　direction　are　pull-out　and　splitting,　respectively.　And　the　fiber　bundles　adhering　strongly　to　the　matrix　can　form　a　neat　fracture　surface.