Abstract: In order to analyze the water inrush reasons of S1210 working face of Ningtiaota Coal Mine, previous water hazard situation during mining process of Ningtiaota Coal Mine and surrounding coal mines was introduced. Water inrush characteristics were summarized. Exploration work after water inrush was introduced. Water inrush channel, water inrush source, water supply condition and water inrush differences were analyzed. As the study, water inrush channels are caving zone and water flowing fractured zone. Direct water inrush sources are Yan'an group sandstone water and Zhiluo group sandstone water, in which Zhiluo group sandstone water is the main direct water inrush source. Indirect water inrush sources are quaternary loose bed water and burnt rock water. Good water inrush supply condition is related to big infiltration coefficient of Wind-blown sand surface. As the study, the difference of this water inflow condition to surrounding coal mines is related to the water inrush point located at the ancient river zone of Zhiluo period.