In this research, 80 wt.% hydroxyapatite (HA)/20 wt.% calcium aluminate (CA) bioceramic nanocomposites were synthesized by using three liquid phase green methods. X-ray diffraction, energy dispersive X-ray spectroscopy, and field emission-scanning electron microscopy were conducted for the characterization of nanocomposites. To study the mechanical (compressive strength, flexural strength, and hardness) and physical (density, porosity, and water adsorption) properties of nanocomposites, these materials were sintered by spark plasma technique, after which the desired properties were measured. To study the bioactivity of samples, SBF vitro test was used. After reviewing the obtained data, results showed that the bioactivity and mechanical properties of the synthesized HA/NA nanocomposites were improved compared with those of the nano-components that form them and those of similar micro-scale composites. The measured maximum compressive strength, flexural strength, and hardness of the synthesized nanocomposites were 440 MPa, 137 MPa, and 202 H_V, respectively. The corresponding amounts for hydroxyapatite nanoparticles were 350 MPa, 115 MPa, and 124 H_V, respectively.