Micro-holes were ablated on the brazing sureface of C_f/SiC CMCs by laser roughing technology. And the C_f/SiC-TC4 brazing joint was achieved by Ag-based filler. Then mechanical properites were tested, the microstructure of the joints and the shear fracture were observed. The results show that, the filler can filled the micro-holes, and the shearing strength of the joints were enhanced.