The Falling Weight Deflectometer(FWD)test, Portable Falling Weight Deflectometer(PFWD)test and Dynamic Cone Penetrometer(DCP)test in field as well as indoor repeated loading test were carried out with three types of subgrade, clay, sandy and earth-rock mixture. The regression relationship of the parameters observed of these three different types of subgrade in field was investigated respectively. The indoor dynamic modulus changed along with different water contents and the relationship waspresented as well as the empirical relationship of the on-site and indoor dynamic The results indicate that in the three different subgrade conditions,a double logarithmic regression relationship between dynamic modulus(EP and EF)and average penetration rate(DP)and a parabola regression relationship between indoor dynamic modulus and water content exist. The regression relationship between field index and indoor dynamic modulus was significant as well.