Abstract: The tomography velocity of compress and shear seismic wave is related with the mechanic parameters of rock and soil. The dispersion curves of the multi channel analysis of surface wave method(MASW)can be gotten from the common middle points cross correlation(CMPCC)gather which is processed as same as the reflection seismic method. We can get the 2D velocity structure from inversing dispersion cures in whole profile,it is well applied in the layering rock and soil strata. The elastic mechanics parameters,such as elastic module and poisson ratio, etc can be deduced by comparing the refraction tomography velocity with surface wave veolocity in the same profile,to supply the useful information in the next engineering geology exploration and design,rock and soil mechanics experiment in the laboratory as well.