Abstract: To study the load transmitting effect of the wedge clamps, a test system is constructed. The response PSD data on the X,Y and Z axis are acquired with the dynamic signal analyzer in tests. Subsequently, the data are analyzed by calculating and comparing the values of two quantified factors defined in this paper. The result shows that the transmitting effects are different on different axis. The main conclusions are as follows. There are different load transmitting effects in different directions for the same wedge clamps: in X direction, the energy is decreased; in Y direction, the energy is almost unchanged and in Z direction, the energy is increased. Only the high frequency part of the transmitting curves is changed when the value of tightening torque is changed, while the related frequency ranges are different on different axes. The load transmitting effect of wedge clamps tightened freely with hands is the most similar to the one tightened with a torque of 0.010 N·m.