High-density aluminium/aluminium nitride (Al/AlN) composites were obtained by high pressure sintering method under 3.0-5.5 GPa and 860-1,690 degrees C for only 20-70 min. The results show that the relative density of Al/AlN composite containing 40 wt.% Al can reach 99.37% under 5.0 GPa and 1,600 degrees C for only 20 min. This sintering time is quite shorter than conventional methods (1-6 h). The fracture surfaces show homogeneous microstructure and transcrystalline fractures are easy to find.