The present study carried out laboratory tests on different kinds of municipal waste samples in order to understand their deformation and strength properties as well as creep deformation. It was therein aimed to help develop huge areas of waste deposit island for future urbanization. Firstly, it was found that municipal wastes follow the conventional ideas of soil mechanics such as the optimal moisture content, effects of densification, and influence of effective stress. It was further shown that wastes are of remarkable shear strength, although the low rigidity at small strain and long duration of creep deformation are problems. Studies were conducted further to reveal that these problems are mitigated by such conventional soil improvement technologies as preloading, compaction, and cement mixing.