Abstract: Abstract: Hazard of water inrush and shaft accidents including overlying aquifer and goaf water,which threaten safe production of coal mine seriously.Therefore,the accurate observation of the height of water flowing fractured zone will provide theoretical basis for the preventionand control of water disaster in coal mines.The paper introduces the methods of observing water flowing fracture zone hight and make feasibility analysis to its.Based on this,the method of observing water flowing fracture zone hight of compound goaf is introduced and applied it to 22105 and 42106 working face of some coal mine.Good observation results are obtained.