Abstract：By means of the geotechnical centrifuge technology，the four different overburden soils are studied by simulating vertical and horizontal faults，whose maximum bedrock offsets are 4.5 and 3.3 m，respectively. The results show that：(1) when bedrock fracture occurs，the influence range inside overburden soils produced by vertical fault (down fault) is greater than that produced by horizontal fault (strike slip fault)；(2) the influence degree inside single middle strength soft soil is greater than that inside the cross bedding¢s sedimentary soils composed of coarse and fine grained soil layers；and (3) under way of bedrock offset 1-3 m，the fracture inside overburden soils appears and all fracture heights are less than 20 m. When the bedrock offset becomes great enough to 4.5 m，the fracture expands inside overburden soils but the fracture heights are all within 30 m. It shows that the centrifuge test results have significant references to both the evaluation of countermeasure against faults in engineering practice and the revisions of some design regulations.
