Site investigations were carried out at several sites in Japan, using Cone Penetration and Dilatometer tests. Soil layers at these sites consist of: marine soft clay, reclaimed fill by loose sand, naturally deposit sand and clay with coral. In addition to these in situ tests, laboratory tests were also conducted to obtain design parameters. 　Using these data, proposed correlations by several researchers were carefully examined to be applicable to Japanese soils. It is found that accuracy of ground parameters estimated by some correlations are considerably poor.