Filling is one of the processing methods for sludge disposal. In landfill of sludge there will be some geoenvironmental problems for sludge has special engineering characteristics. Layered rolling is used in landfill and test samples are prepared under energy of standard compaction test. The test results of shear strength and permeability coefficient for sludge mixed with municipal solid waste (MSW) as well as stability analysis of slope are presented

considering the effects of leachate and pore air pressure from degradation. It is shown that the strength of sludge mixed with MSW is lower than MSW and higher than sludge; strength characteristic of sludge is improved. Permeability coefficient of sludge mixed with MSW is a light different from MSW; permeability is not obviously worse than MSW and is higher than sludge. With the increase of sludge content

slope stability will increase firstly and then decrease. The suitable mixing content of dewatered sludge will be determined by results of test and slope stability analysis. The safety factor of slope stability analysis will decrease about 15%-20% considering the effect of pore air pressure from degradation.