Abstract: Rheological property caused by dispersant and its content, binder content and solid loading was studied through General Rheometer. The microstructure and phase composition of SiC joint were studied by SEM and EDS and factors affecting the connection strength were also discussed. Results showed that the rheological property of the slurry was better at 5wt.% castor oil phosphate of dispersant, 2.6wt.% PVB of binder and 26vol.% solid loading, the composite filler film toughness is perfect, and the reinforcement is homogeneously distributed. The microstructure of the SiC joint using the composite filler film as filler indicated that the interface is dense and no defects between the SiC joint, its the thickness is 1.0～1.5 μm and the reinforcements TiC are uniformly dispersed in the metal filler matrix with no chemical reaction. TiC addition can improve the connection strength. However, the main factors affecting the strength is the thickness of the reaction layer. The maximum four-point flexural strength of the brazed joints is 92 MPa when the thickness of the reaction layer was 1.5 μm.