Objective Design a newtype bone plate PC-LCP and determine its mechanical properties and the biomechanical stability.Method Four point bending test was conducted to determine the mechanical properties of each of the 3 pairs of PC-LCP、LC-DCP、DCP;using 20 pairs of new fresh sheep tibia,mid-shaft transverse fracture were created and fixed with PC-LCP、LC-DCP、DCP,respectively;and then the four point bending、torsion and axial compress tests were conducted to determine the bending、torsion and axial compress stiffness.Result Although the bending stiffness of PC-LCP is less than that of DCP,LC-DCP and have significant difference,the biomechanical properties of fixed fracture bone by these three type bone plate showed no significant difference.Conclusion The new PC-LCP has the similar biomechanical properties as the other two type plates when used to fix the broken bone and has the adequate stability.