In order to realize rapid detection of measurement accuracy of numerical control equipments, a set of two-dimensional gimbal mount rotatory axes is designed for laser tracing measuring system. A high precision reference sphere serves as the reflection unit, and it is fixed on the base, which ensures laser tracing measuring system perform in a large tracking angle and avoids the influence on measurement accuracy caused by the movement of rotatory axes. The effect of the main geometric errors of axes on measurement accuracy of laser tracing measuring system is analyzed. The relation between run-out error of axes and measurement accuracy is studied, and the model of run-out error of axes is simplified. Experimental results show that measurement error of the laser tracing measuring system is less than 0.1 μm when the run-out error is within the range of ±5 μm, which indicates that the laser tracing measuring system can reduce the effect of run-out error.