Abstract: Diamond grinding tools are widely used in aerospace, mold manufacturing, electronic devices, optical materials, medical devices, stone processing and other fields because of their advantages of high grinding efficiency, long service life and high precision of workpiece processing. The grinding function of the tools is realized by the exposed abrasive grain, the height of which from the surface of the bonding agent is defined as the protrusion height. Abrasive tools can only perform the best grinding performance when they have the appropriate protrusion height. Therefore, the testing and regulating technology of the protrusion height is very important for the preparation of high-performance grinding tools. In this paper, we reviewed the evaluation parameters, testing methods and control techniques of diamond protrusion height and analyzed the problems in the research field. Finally, we pointed out the future research direction of protrusion height test and control.