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In this paper, interface coating was prepared on the surface of the mullite fiber through SiO2-Al2O3-ZrO2 sol.And mullite fiber reinforced mullite composites were prepared by the quartz composite slurry and alumina sol.Results showed that SiO2-Al2O3-ZrO2 interface coating could uniformly distribute on the surface of mullite fibers,and the appropriate interfacial bonding strength was obtained,which made a contribution to the high density mullite fiber reinforced mullite composite, whose density reached more than 1.8g/cm3, tensile strength reached more than 50MPa.So mullite fiber reinforced mullite composites became a new generation of high temperature wave transparent material.