Abstract: In order to solve the problems of single function of data processing software for MWD in mines，poor results display，insufficient information fusion，etc.，a data processing software for MWD in mines was developed using C# language and SQL Server database. The software has some functional modules such as real-time data transmission，drilling data processing，drilling trajectory evaluation，and drilling trajectory three-dimensional display，which can realize real-time transmission of on-site measurement data. The real-time data transmission module in the software uses the network transmission protocol to receive the raw data collected by the underground mine borehole tracker in real time，and read the real-time transmitted raw data and perform data processing. The data reading module can read drilling trajectory data in different formats，and can process and graph data in different formats，and realize the functions of rapid drilling trajectory processing，depth analysis and evaluation of drilling trajectory data，drilling group database management and 3D status display of trajectory drilling rigs. It can also realize the three-dimensional mapping technology of the trajectory of a single borehole or a group of boreholes in the borehole group，and realize the three-dimensional display of the data of the roadway，the drilling field，and the trajectory of the borehole. The designed drilling hole passes through the coal inlet point coordinates and coal outlet point coordinates of the coal seam section. The actual drilling trajectory passes through the coal inlet point coordinates and coal outlet point coordinates of the coal seam section. After the discrete data points are gridded，the surface of coal inlet point and coal outlet point，and coal seam occurrence map are generated. Differential identification of parameters such as borehole number and borehole depth can visually display the coverage map of the boreholes in the drill site area. From the coverage map，it can be seen whether the boreholes in the area are evenly distributed and whether there is a blank zone or not. For the blank zone，the coordinates of the supplementary drilling are automatically calculated through the coordinates collected by the coverage map，which can better guide the subsequent drilling construction. Field tests have proved that the measurement-while-drilling data processing software has stable communication signals，accurate measurement data with comprehensive functions and good display effects，which provides strong technical support for optimizing directional drilling construction.