Abstract: Makeng Iron Mine in Fujian belongs to a roof karst water-filled mine with complicated hydro-geological conditions.From mining start some years ago，sudden water inflow accidents constantly happened and have severely restricted the safety production.The groundwater flow field form mainly reflects the comprehensive hydro-geological condition.The paper  dopted the karst water level data of different periods to draw and analyze the karst water flow field form in each period.It is summarized that with continuously dewatering of karst water，the recharge，runoff and discharge conditions of karst  water system in Makeng mine is mainly controlled by the fault and also varied with karst development and lithology differences.And groundwater flow field form not only has no good consistency in space，but obviously restricts the overall dewatering of karst water in mine.For the main factors in variation of flow field form，a targeted dewatering  ountermeasure is proposed.

Key words: Karst water-filled mine, Groundwater flow field, Groundwater control