To　solve　the　problem　of　macro-crack　and　residual　silicon　content　of　SiC　ceramic　parts　caused　by　the　carbon　black　agglomeration　and　insufficient　content,　an　effective　method　to　control　the　micro-structure　defect　and　residual　silicon　content　and　to　improve　the　mechanical　properties　of　SiC　ceramic　parts　at　high　temperature　was　proposed.　Short　carbon　fibers　(CF)　serve　as　the　carbon　source,　the　dispersibilities　of　carbon　black　and　short　carbon　fiber　in　ceramic　slurry　were　comparatively　investigated　and　the　influences　of　the　two　carbon　sources　on　the　quality　of　the　green　body　were　analyzed.　The　micro-structure　and　phase　composition　of　the　reaction　infiltrated　Cf/SiC　ceramic　were　observed　by　SEM　and　XRD.　The　effects　of　carbon　fiber　content　on　high　temperature　bending　strength　and　fracture　toughness　of　the　SiC　ceramic　were　discussed.　The　results　show　that　short　carbon　fibers　better　disperse　in　ceramic　slurry,　and　large-size　pores　and　cracks　in　the　ceramic　green　body　can　be　well　controlled.　When　in　the　reactive　melt　infiltration　process,　the　porous　structure　formed　by　carbon　fiber　and　ceramic　particles　facilitate　the　infiltration　of　liquid　silicon,　and　the　carbon　fiber　dissolves　in　the　silicon　liquid　and　reacted　form　β-SiC　surrounding　the　carbon　fiber　surface.　As　the　volume　fraction　of　short　carbon　fiber　increases　(0　to　40%),　the　residual　silicon　content　in　the　ceramic　matrix　decreases,　and　the　high　temperature　(1　350　)　performance　of　the　ceramic　part　increases　firstly　then　decreases.　When　the　short　carbon　fiber　volume　fraction　gets　20%,　the　high-temperature　flexural　strength　and　fracture　toughness　reach　the　highest,　343±19　MPa　and　5.04±0.27　MPa•m1/2　respectively.　©　2019,　Editorial　Office　of　Journal　of　Xi＇an　Jiaotong　University.　All　right　reserved.