Abstract: The karst fissure medium can be regarded as dual medium of porosity. According to continuity principle of flow, law of conservation of mass and Darcy’s law, the dual medium mathematical model of unsteady flow in fissurekarst artesian aquifer is established, and the finite volume method is adopted to get the solution, taking Longgang district in Shenzhen as an example to verify this model. The consistency of the calculated groundwater level and the measured shows this simulation model can well reflect the actual hydrogeological condition.

Key words: karst fissure, dual medium, finite volume method, contour map