Study on settlement of organic substance degradation is very important for municipal solid waste（MSW）landfills. The long-term settlement of MSW landfill resulting from decomposition will usually represent the major proportion of total settlement

and it is likely to continue for many years. A large settlement may lead to breakage of the geomembrane and damage of the cover system in a modern MSW landfill. It is a very complex task to calculate the settlement because the waste material exhibits heterogeneous engineering properties that vary over locations and time with a landfill. Now a new degradation settlement model of organic substance of MSW landfill is presented based on the testing data. The model has less parameter. The degradation settlement of Tianziling MSW landfill is predicted by applying the model.