定向钻技术是当前井下钻探的主流趋势，中大型煤矿往往会根据矿井安全生产需要分批购置不同厂家的钻机或随钻轨迹测量装置，新的随钻测量装置的精度评估与校准是煤矿使用单位面临的技术难题。本文以已有使用较为精准的测量装置为基准，采用钻孔复测的方法，对新测量装置进行评估与校准，取得了良好的效果，同时对磁偏角变化引起的测量精度问题进行了探讨。

 Directional drilling technology is the mainstream trend of current underground drilling. Medium and large coal mines often purchase drilling rigs or MWD devices from different manufacturers in batches according to the needs of mine safety production. The accuracy evaluation and calibration of new MWD devices is a technical problem faced by coal mine users. In this paper, based on the existing more accurate measuring device, the new measuring device is evaluated and calibrated by the method of borehole retest, and good results are obtained. At the same time, the measurement accuracy caused by the change of magnetic declination is discussed.