Laboratory measurements of soil properties can be used to supplement or confirm the results of field
measurements. They are necessary to establish values of damping and modulus at strains larger than those that can be obtained in the field or to measure the properties of materials that do not exist in the nature. The Dynamic Deformation Characteristics of the soil are used in order to calculate seismic response of ground, earth structures and structure-ground response. To obtain the dynamic proprieties of the soil we used improved cyclic triaxial equipment that is also used to express phenomenon that make soil to fail under seismic loading. The upgrade of the equipment after the training period in Japan at BRI, Tokyo Soil and Tokyo University and during the counterpart JICA program improved the quality of the obtained results.