Abstarct: according to the social life and the rapid increase of population in human societies , the amount of urban waste production has increased dramatically . One way to dispose of this garbage from the environment around human life is to bury them . the landfill practices have caused many problems in the environment , and on the other hand , atmospheric precipitation is caused by atmospheric pollutants that have negative impacts on the mechanical behavior of soils due to the soil permeability or open spaces . according to this study , baxsed on the fundamental changes of sewage on clay and the final resistance of the desired soil , it must be evaluated and investigated , so that , according to this study , the effect of sewage on the soil and the final soil properties of the urban solid waste is studied , and the results of this study were evaluated and presented in the diagram . in this study , using standard methods of different test (and by percentages of 0 % , 30 % , 70 % , 70 % and 100 % sewage) were determined that strengthening and permeability decreases significantly , reducing the mechanical resistance of the soil .