The flexural strength of MoSi₂ based composite reinforced with Nb sheets has been investigated, based on the detailed examination of their microstructure and fractured surface. Both sintered density and porosity of Nb/MoSi₂ composites were also examined. Nb/MoSi₂ composites were fabricated by different conditions such as temperature, applied pressure and its holding time, using a hot-press device. The volume fraction of Nb sheet in this composite system was fixed as 10%. The characterization of Nb/MoSi₂ composites were investigated by means of optical microscopy, scanning electron microscope and three point bending test. Nb/MoSi₂ composites represented a dense morphology at the interfacial region, accompanying the creation of two types of reaction layer by the chemical reaction of Nb and MoSi₂. Nb/MoSi₂ composites possessed an excellent density at the fabricating temperature of 1350℃, corresponded to about 95% of theoretical density. The flexural strength of Nb/MoSi₂ composites were greatly affected by the pressure holding time at the same fabricating temperature, owing to the large suppression of porosity in the microstructure. Especially, Nb/MoSi₂ composites represented a good flexural strength of about 310 ㎫ at the fabricating condition of 1350℃, 30㎫ and 60min, accompanying the pseudo-ductile fracture behavior by the deformation of Nb sheet and the interfacial delamination.