Abstract: Long hole directional drilling technology and equipment can effectively solve the problem of gas drainage by drilling in our country,a lot of experimental studies and field applications for this technology and equipment have been carried out in China.This paper introduces the principle of downhole motor slippage long hole directional drilling technology and the achievements and breakthroughs of long hole directional drilling technology in our country,contrasts and analyses the several typical long hole directional drilling equipment in domestic and foreign, summarizes the four concrete application forms and the corresponding cases of gas drainage in underground by utilizing the long hole directional drilling technology and equipment,concludes the problems in research and application of this technology and equipment.The results show that:it is a frequently used and effective method to use long hole directional drilling in gas drainage.However,there are still many problems such as difficulties for drilling in soft coal seams, numerous and complicated drilling qualifications, complex and expensive equipment and some of the equipment are subjected by international monopoly etc in this area.China should increase investments, break the monopoly, and strive to achieve independent innovation.