Abstract: Measurement while directional drilling technology has the characteristics of high drilling efficiency and high accurary of borehole trajectory control,therefore,it is widely applied to extract the gas in coal mine and explore the geological structure of mine.Measurement while directional drilling technology is tend to be used to deal with the water disasters in coal mine in recent years.At present,rotary drilling is main drilling construction method to prevent and control the water in coal mine,but the construction efficiency of rotary drilling is low,grouting reinforcement scope of rotary drilling is small and reinforcement effects are not so good.The equipments of measurement while directional drilling and drilling technology are discussed so as to do some research on the application of measurement while directional drilling technology in the process of grouting reinforcement the coal seam floor in Zhaogu No.1 coal mine.The research results prove that,measurement while directional drilling technology has the advantage of high construction efficiency, wide reinforcement scope and perfect grouting effect.

Key words: Measurement while directional drilling technology, Preventing and controlling water disasters, Coal seam floor, Grouting reinforcement