Based on experiment using the typical artificial MSW to study the transient modulus changing of MSW is carried out. The study has shown that the transient modulus of MSW is changed when the organic content
the initial moisture
the initial void ratio or the degradation degree of MSW changing; and some changing laws due to influences of above-mentioned factors are obtained. The mechanism is analyzed combined with the property of MSW. These conclusions are very useful to the research of distortion of landfill and the design of landfill in the future.