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In order to detect the hidden dangers in dam��like fractures��caves and leakage layers��the authors establish digital model and physical model using three-dimensional high density resistivity method�� The results show that the form of fractures by indoor physical model in three-dimensional maps and slice figures have changed��but their distribution ranges��locations and actual proportions are almost same��indicating that the numerical simulation results can be a theoretical guide for engineering practice with a certain reference value��