Abstract: In this paper,an unsteady parallel fracture flow model and a combined finite element-convolution approach are used to simulate and analyze karst groundwater flow systems.Compared with conventional equivalent porous medium model,the water level changes simulated by this double medium flow model are slower and the time of being stable is longer.For the water level simulated by this model,there exist clear water level change stages at the observation well near the pumping wells.The process of water...