Abstract: Through the analysis of principle, advantages and disadvantages of the frequently-used technologies for gas pre-drainage boreholes in soft coal seams, aiming at the problems such as instability of coal seams, big difficulty in gas drainage boreholes in coal seams, shallow drilling depth, sticking of tool and severe gas spray in orifice in a mine of Yima Coal Group, different types of drill rigs, different drilling tools and different technologies were used to conduct field tests. The fast drilling technology and equipment that are suitable for drilling in unstable and outburst soft coal seams are formed in the mine preliminarily, which not only solves the actual problems in the mine, but also has reference significance for drilling in similar coal seams in other areas.