SiC fiber-reinforced TB8 composite was prepared by foil-fiber-foil method. The microstructure of composite was characterized by optical electron microscopy( OM),scanning electron microscopy( SEM) and electro probe microanalysis( EPMA),and the effect of pressure,temperature,time and other process parameters of vacuum hot pressing on the microstructure of SiC fiber-reinforced TB8 composite. The results show that pressure significantly affects the intermatrix bonding and the combination of matrix and SiC fiber. Temperature has a greater impact on the interface reaction between fiber and matrix. Through the optimization of process,the thickness of interface reaction layer can be effectively controlled,and the SiC fiber-reinforced TB8 composite with excellent microstructure can be obtained.