Thermoplastic polymers are widely used materials in the biomedical field due to their biocompatibility, ease of production and chemical stability; however, their mechanical properties are generally low. In this study, a short carbon fiber reinforced composite was produced to improve the mechanical properties of thermoplastic materials. Pre-processing and post-processing were applied to further improve the mechanical properties of the composite. Optimization of process parameters such as infill density and infill pattern and post-processing parameter such as annealing were performed. As a result of the experiments, the highest impact strength for PLA material is 18.98 kJ/m 2 and the lowest impact strength is 6.33 kJ/m 2 . In addition, the highest tensile strength was 44.68 MPa and the lowest tensile strength was 5.38 MPa. The reliability rates of tensile and impact strength analyses are 98.18% and 96.67%, respectively. SEM and XRD analysis indicated that the parameters affecting the product properties are not only critical for mechanical properties but also affect the internal struct
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