Abstract: Several water inrush accidents have occurred in the working face 1418 of the first panel of Yuhua coal mine in Tongchuan City, Shaanxi Province during mining, threatening seriously the normal production and miners' life. The paper, from the geological and hydrogeological data of the coal mine, analyzed the background, source of water and passage of water inrush in the working face, concluded that the water in sandstone fracture aquifer in the lower member of Luohe Formation is the major water source for filling the stratifugic layer, the fractured zone formed after coal seam mining is the main water channel. Through theoretic analysis and simulation research of movement and failure law of the overlying strata, the development process of water-flowing fractured zone and the location of the possible development of stratifugic layer, the formation, the process and water inrush process were analyzed and determined. Thus the water inrush mechanism of the stratifugic water in the roof of working face 1418 in Yuhua coal mine was summarized, providing a good foundation for proposing practical and effective water control measures for realization of safe and highly efficient production in the later stage of the mine.