The　PEEK　composites　with　the　special　Characteristics　have　been　used　in　the　fields　of　chemistry,　machine,　and　electricity　and　so　on.　The　infiltration　is　the　key　to　the　properties　of　composites.　The　text　discussed　the　mechanism　of　unite　of　the　inorganic　and　the　organic　by　the　mechanical　properties,　and　advanced　the　polyps-theory　and　core-felted　theory　of　the　infiltration.　The　composites　in　this　condition　are　in　the　favorable　properties.　The　coupling　can　improve　the　performance　of　composites,　and　the　chemical　bonds　theory　is　testified.　From　the　results　of　the　experiments,　the　CaCO3　whisker　treated　with　the　coupling　SPEEK　affined　with　the　polymer　PEEK　tightly,　and　well-distributed　in　the　body.　And　the　coupling　makes　the　interface　cohering　better,　and　improves　the　composites　performance.　The　tensile　strength　of　the　composites　treated　with　the　coupling　is　higher　than　the　untreated.　When　the　content　of　CaCO3　whisker　is　less　than　20%,　the　tensile　strength　of　the　treated　composites　is　higher　than　the　pure　polymer　PEEK,　and　when　the　content　is　equal　to　15%,　the　strength　reaches　the　maximum.　And　the　flexural　modulus　of　composites　increased　with　the　higher　content　of　the　composites.