The　influence　of　cordierite　binder　on　the　dynamic　fatigue　process　of　mullite　ceramic　was　investigated　by　the　method　of　asymmetric　sin　wave　dynamic　load　variation.　The　damage　parameters　defined　by　the　method　of　system　analysis　were　used　as　major　evaluation　indexes,　and　The　factors　influencing　the　fatigue　characteristic　of　mullite　ceramics　was　discussed　by　the　crystal　structure　and　microstructure.　The　content　of　glass　phase　has　greatly　affected　the　fatigue　characteristic　of　mullite　ceramic.　The　results　showed　that　certain　amount　of　glass　phase　can　accelerate　the　densification,　improve　the　strength　of　the　body,　the　anti-fatigue　property　of　the　material　is　improved.　However,　due　to　its　loose　and　irregular　structure,　the　glass　phase　often　becomes　the　weak　link　of　fatigue　crack,　so　redundant　glass　phase　can　shorten　the　fatigue　life　of　the　ceramic.　When　the　adding　amount　of　cordierite　is　12%,　and　the　content　of　glass　phase　in　the　system　is　33%,　the　fatigue　life　of　mullite　ceramic　is　maximum　(12　kilocycles).