Enormous amount of urban wastes continuously produced by the human activities in the big cities are collected and contained in the waste disposal area surrounded by the dikes. These wastes consist of various constituent from the highly compressible organic materials to the incompresible metal fragments. In order to utilize the space thus created, the engineering properties of this complicated material must be studied. The authors are requested to test the compression characteristics of urban wastes by Toyama prefectural government and by Tokyo metropolitan government. 　Percentage of compressible organic component by dry weight is 12% in the case of Toyama wastes and 70% in the case of Tokyo wastes. In this article, coefficients of consolidation, volume compressibility, and secondary consolidation of two wastes are presented togegth with some considerations on the testing procedures for classification and consolidation of urban wastes.