Abstract: In view of the defects of short lifespan of single layer brazed diamond tools in the market, multi-layer brazing diamond hole drilling was designed. The formulations of different working layers were made, and a reasonable brazing process route was established, the samples and hole drills were then fabricated. The bonding interfaces between the brazing filler metal and the substrate, as well as between the brazing filler metal and the diamond, were analyzed by EDS analysis, and the microhardness of the matrix with different formulations and the flexural strength of the samples were tested. Finally, the hole drills were used for continuous drilling tests on alumina ceramics. The results show that the matrix is good bonded with ordinary diamond and titanium coated diamond, respectively. There is no difference in the reaction generation between the two kinds of diamond and brazing, but the addition of Ti coating effectively suppresses the reaction degree between diamond and brazing. Microhardness test and three-point bending test confirm that the addition of WC can effectively improve the wear resistance of the body, and the addition of WC can improve the strength of the working layer. Continuous drilling test shows that the hole drill made of titanium coated diamond has higher processing efficiency, but the diamond holes have comparable life. In addition, the addition of WC within a certain concentration range can effectively improve the service life and processing efficiency of the hole drill, and the comprehensive processing performance of the hole drill is best when the added amount of WC is 15%.