Abstract: Correct analysis and evaluation of municipal waste landfill geological characteristics and seepage program play a very important role in municipal waste landfill siting and design and construction operations.The geological characteristics of municipal waste landfill in Huaian city,such as natural environment, Stratigraphic structure and lithology are described,hydrogeological conditions of municipal waste landfill,as well as aquifer distribution, aquifer thickness and permeable are analysed in detail in the paper.On the basis of laboratory test and in-situ tests,comprehensive determined of the strata permeability coefficient greater than 1×10^-7 cm/s in municipal waste landfill siting,indicated that does not have natural anti-seepage conditions,must use the artificial anti-seepage system to be able effective to prevent pollution of environment form the leachate of refus.