Coal mine mining process reliability is directly related to the safety of production， improve the accuracy of coal mine measurement is the focus of the field of research. Based on the measurement level， this paper studies the measurement method of improving the precision and safety. Through the analysis of the relevant data using GPS technology， the key technical advantages of downhole tunneling measurement are verified， and the optimal penetration point theory is put forward. The actual parameters are used to locate the final penetration point. The experiment proves that the measurement system can be used Measuring distance.