Abstract: To enhance the performance of PPC and reduce the degradation speed of calcium sulphate hydrate (CSH), the PPC/CSH composites were prepared by a meltblending method, andtheir mechanical properties and degradability were investigated.The results indicated that the CSH prepared by a highpressure hydrothermal salt solution method was a semihydrate of calcium sulfate with a fibrous structure and large ratio of length to diameter, which made it suitable for the enhancement of polymer.The mechanical test results indicated that the introduction of CSH could improve the tensile strength and bending strength of PPC composites significantly, and however the elongation at break of the composites decreased gradually with an increase of CSH content.After added into PPC, the CSH still kept a good biological activity without any change in its crystalline structure.Morphological investigation indicated that the CSH was well dispersed in the matrix at a low content due to good compatibility, but an aggregation occurred at a high loading of CSH.The degradation rate of CSH was found to decrease significantly after blending with PPC, and its degradation rate could be well controlled. Moreover, the mechanical properties of PPC/CSH composites were improved.These results confirmed a good potential for the bonerepairing application of PPC/CSH composites.