Abstract: To study the influence of fixing agent on quality of brazed diamond tools,three agents namely SZ,NH and GY are made into testing samples.Their surfaces are observed and actual cutting & drilling experiments are implemented.Resultsshow that GY agent leaves least residual carbide with best appearance,while NH agent ranks second and SZ agent performs worst.As with the blades and bits made with these three agents,those made with GY agent have longest work life and fastest speed,followed by those made with NH agent and those made with SZ agent lists in the bottom.