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The development of Mg-based biomaterials in orthopedics has been extensively studied in the past 17 years. Various methods and compositions were developed to obtain Mg-based biomaterials that have mechanical properties and corrosion resistance which match the bone. One of the developments was done by composing Mg alloy with other material. In this research,will be synthesized biokomposit Mg6Zn-xHAp with sintering process at 3500C. The biocomposites were synthesized by mixing the HAp powder on the Mg6Zn powder mixture with the composition of 5%, 7% and 9% using ball milling for 30 minutes. Biocomposites were characterized by Scanning Electron Microscopy with Energy Dispersive Spectroscopy (SEM/EDS), X-ray diffraction (XRD) and Potensiostat. The SEM / EDS results showed that the Mg6Zn-xHAp biocomposite had microstructures whose grain size decreased as the HAp composition got larger with HAp at the grain boundaries only. The XRD pattern of Mg6Zn-xHAp biocomposite indicated that some of Zn atoms had dissolved in Mg to form a solid solution in the sintering process. The greater composition of HAp in the material results in a decrease of Zn in Mg. The greater composition of HAp in the material results in a smaller Zn solubility in Mg. In addition, XRD results also showed that the crystallite biocomposite size is smaller when the composition of HAp in it is greater. Thus, it can be said that HAp can act as a refiner of the Mg alloy. The presence of HAp in the material also affects the corrosion rate where the greater the composition of HAp in the material the smaller the corrosion rate of the resulting material.