This article introduces the structure,operation principle (except micrometer) of measuring tool grinder and the influence of the change of parameters on grinding. Furthermore, the author classifies and analyses the problems, and points out improvement methods such as individually equipping grinder to reduce the grinding stroke, using the carving line on the jaw cupper block to locate calipers, determining the coinciding of two side faces of leading ruler and square ruler to ensure the paralleling between the outer measuring claw and slider.