After the pulsed laser truing and dressing,the graphitized deterioration layers of bronze-bonded diamond grinding wheels are investigated theoretically. When the laser power density is 1.68×108-3.359×108 W·cm-2, the temperature evolution on the diamond surface is numerically simulated. The study results show that the time for which the diamond temperature reaches the graphitization temperature is 435-440 ns, and the graphitization degree is low. A new method for pulsed fiber laser truing and dressing of bronze-bonded diamond grinding wheels assisted by liquid column flows is proposed, which clearly reduces the graphitization degree.