The disturbance of overlaying strata, causing the water flowing fractured zone run through the aquifer, makes the accident between water－inrushing and rock－crushing happen from time to time. In order to reveal the development law of water flowing fractured zone, the combination of influencing factors which have been analyzed for the water flowing fractured zone is established, and then the different situation for the development of the water flowing fractured zone with different factors is discussed with the UDEC. The results showed that both the distance from the key stratum to the confined aquifer and the position of the key stratum influence the development of the water flowing fractured zone best. The arrangement of the factors for the water flowing fractured zone are the distance from the key stratum to the forth aquifer, the position of the key stratum, the breaking span of the key stratum and the interval of the key stratum which is orderly from the best to the worst.