The　tribological　behaviour　of　CaCO3/10%　PTFE/PEEK　composites　with　different　content　of　CaCO3　whisker　were　investigated　by　MM200　block-on-ring　apparatus　in　comparison　with　neat　PEEK　and　CaCO3/PEEK.　The　morphology　of　wear　traces　and　transfer　film　were　observed　by　scanning　electron　microscopy　(SEM).　It　is　found　that　CaCO3/10%　PTFE/PEEK　exhibits　considerably　lower　friction　coefficient　and　wear　rate　in　comparison　with　neat　PEEK　and　CaCO3/PEEK.　With　increase　of　CaCO3　whisker　content,　coefficient　of　friction　of　PEEK　composites　continuously　decreases　but　the　trends　in　wear　performance　differs.　The　specific　wear　rate　of　(15%-20%)CaCO3/10%　PTFE/PEEK　shows　a　minimum　value　of　3.3　×　10-7　mm3/Nm,　which　is　only　3.6%　of　that　of　neat　PEEK,　followed　by　a　slow　increase　for　further　CaCO3　whisker　addition.The　20%　CaCO3/10%　PTFE/PEEK　composite　shows　excellent　combination　of　friction　coefficient,　wear　rate　and　cost.　SEM　observation　indicates　that　CaCO3　whisker　contributes　to　abate　the　scuffing,　adhesion　and　plastic　deformation　of　the　filled　composite,　while　a　thin,　uniform　and　tenacious　transfer　film　closely　related　to　tribological　behavior　is　formed　on　the　surface　of　the　steel　ring　due　to　inclusion　of　PTFE,　and　the　both　contribute　to　the　better　wear　resistance　of　the　filled　PEEK　composite.