Abstract: Underground rig is the main equipment for gas extraction in coal mine, mud pump is a necessity for drill rig. The research and manufacture of the crawler mud pump truck BLY 260/9 will make the underground drill rig relocate conveniently and operate safely, and also make the corollary equipment highly integrated. This kind of mud pump truck adopts crawler structure and integrates accessory devices on a platform which features the independent power to guarantee the walking. The field tests in Chengzhuang mine and Sihe mine of Jincheng Anthracite Mining Group show that the matching of mud pump truck and tunnel drilling rig, especially for directional drilling, has dvanced and reliable technology solutions, good effect in drilling gas drainage borehole, can provide an effective solution for drilling equipment configuration.