In this study, femurs from 7 cadavers were fractured and then immobilized with wave plates andcommon compressive plates respectively. Comparisons wtre made on biomechanical properties ofthese two types of plates by means of axial compression, three-point bending and twisting test.Results of the studys showed that the wave plates are significantly different from the commoncompressive ones (P<0.01) in that the strength and rigidity of the wave plates are respectively 32%and 33% greater. Experiments proved that the stress resistance rate of the wave plates is 32.5% lessthan that of the common compressive plates,which contributes to the improvement of the stressconditions for bone remodelling and quickens the growth of the callus, the wave plates arepreferable to the common compressive plates, and hence it is in accord with the principle ofbiomechanics to adopt the wave plates. Wave plates were used in treating 147 patients with fractureof the femoral shaft. After 324 months of follow-up, the rate of excellent recovery turned out to be95.8%,indicating that the application of wave plates is a desirab1e method of internal fixation totreat fracture of the femoral shaft, and therefore deserves further popularization in clinical practice.