The　composite　blocks　of　polyetheretherketone(PEEK)　filled　with　different　content　of　calcium　carbonate　(CaCO3)　whisker　and　polytetrafluoroethylene(PTFE)　were　prepared　by　compression　molding.　Dynamic　mechanical　thermal　analysis(DMTA)　was　performed　on　PEEK　composites　in　order　to　investigate　thermally　activated　molecular　relaxation　processes　and　their　impact　on　mechanical　properties.　Dynamic　modulus　and　mechanical　loss　factor　(tanδ)　were　continuously　measured　during　a　DMTA　thermo-scan　carried　out　at　25~300°C.　The　selected　test　configuration　and　operating　mode　were　single　cantilever　stretching　and　constant-amplitude　forced　flexuraloscillation,　respectisely.　The　analysis　results　show　that　all　materials　show　a　large　change　in　storage　modulus　at　the　glass　transition　temperature(Tg).　CaCO3　whisker　exhibits　an　significant　effect　on　dynamic　stiffness　of　the　composites　at　low　and　high　temperatures.　The　increase　of　whisker　content　contributes　to　a　rise　of　the　storage　modulus.　These　modulus　of　CaCO3　whisker　filled　PEEK　composites　are　higher　than　those　observed　for　pure　PEEK,　especially　below　Tg.　Addition　of　PTFE,　which　is　closely　related　to　tribological　behavior,　reduces　the　storage　modulus　of　CaCO3/PEEK　at　temperature　below　Tg,　while　the　storage　modulus　above　Tg　do　not　change　much.　These　effects　in　thermal　mechanical　properties　are　of　benefit　to　improve　tribological　behavior　of　the　filled　PEEK　self-lubricating　composites.