This paper deals with experimental studies on the filled up grounds with cohesive soils for housing lots. Though many kind of soils are made use of housing lots constructions, cohesive soils comparatively contain many technical problems in the construction of the filled up ground. In the present paper the experimental results are shown in regard to the consolidated undrained shear tests of cohesive compacted soils. The results of this study are summarized as follows. 1) The saturated compacted cohesive soils have the respective compression curves according to the compacted water contents. 2) The saturated compacted cohesive soils, however, they have the same failure envelope, have the respective critical state lines according to the making methods of the test samples. 3) The consolidated undrained shear strength of saturated compacted cohesive soils can be estimated by fundamental properties of soils.