Abstract: The drilling tracker and hand held tracker measurement software for underground rotary borehole in coal mines has problems such as single function, counterintuitive display, inability to analyze and display the blind area of gas extraction and inability to guide the construction of boreholes. In order to solve the above problems, a borehole data processing and 3D display software is designed. The software includes four functional modules, including borehole data pre-processing, borehole depth and track calculation, borehole track 3D modeling and display and borehole track design guidance. The borehole data pre-processing module focuses on the calculation of geomagnetic declination and the elimination of data outliers. The borehole depth and track calculation module uses the borehole water pressure monitoring data combined with the measured point inclination data to realize the extraction of borehole hydrostatic pressure and the calculation of borehole depth. Moreover, the module obtains the calculation of borehole track and the extraction of borehole measuring point coordinates so as to complete the deep-level data mining of the borehole track. Borehole track 3D modeling and display module presents borehole information such as borehole track and coal seam direction through 3D entities effectively, which facilitates the determination of the blind area for gas extraction from borehole. The module includes the 3D display of borehole group track and coal seam distribution, the coverage area of designed borehole in the coal face, and the coverage area of actual borehole in the coal face. The borehole track design guidance module provides the blind area of the borehole extraction, calculate the offset characteristics of the existing borehole track, and provides the guidance track of the subsequent supplementary borehole construction. The software is used to perform 3D display and offset law analysis on the actual borehole of a mine, and the drilling site is supplemented by drilling with precision drilling technology and track measurement technology. The extraction coverage area of the boreholes after supplementary drilling reaches more than 95% of the designed coverage area. The module controls or eliminates the blind area of gas extraction in boreholes effectively. The software solves the problem of 3D display of the track of the drilling site or roadway borehole group, reproduces the relationship between the borehole trajectory and the coal seam visually, and provides a new method for quantitative evaluation of the blind area of gas extraction in boreholes.