MoSi2-borosilicate glass coating with MoSi2 as emittance agent was prepared on mullite fibrous ceramics for enhanced superficial infrared radiation via an in-situ reaction method. The phase and structure evolutions during sintering were studied in detail. The infrared radiating property, impact resistance, thermal shock resistance and thermal endurance of the coating were investigated comprehensively. The results show that the coating was dense and flat, and it tightly adhered to the substrate by mechanical interlocking. During the sintering process, the low-temperature oxidation of MoSi2 was restrained due to the package of binder phase formed below 500°C, and the coating was fully densified via the viscous flow of molten Si. The total emissivity of the as-prepared coating was higher than 0.85 and the emissivity at low wavelength was higher than 0.9. The impact resistance was preferable attributed to the reinforced transition layer at the interface. The coating went through 30thermalcycles between 1500°C and 25°C without cracking and spalling. The total emissivity declined merely by 4% after oxidation at 1500°C for 50h, which was influenced by the MoSi2 content and the surface roughness of the coating.