The geotechnical analysis of this research shows the results of a program conducted in tropical soils of the Peruvian Amazon plain for over 20 years. With this information a database has been developed. It has collected samples and tests that establish the characteristics of these unsaturated soils in all watersheds that shape the Peruvian tropical region, using alternative means of obtaining the characteristic curves and laboratory tests. The results in this paper show geotechnical occurrences that indicate substantial similarity and differences of stress and deformation behavior of Peruvian tropical soils. The presence of these unsaturated soils in this region, where unique features of climate and difficult geological formation are present, makes this information very valuable for engineering design and construction development due to its models applicability to different stress patterns.