As one type of continuous ceramic fiber reinforced ceramic matrix composites that emerged in the 1990s, alumina/alumina composites (Al2O3/Al2O3) have become a major category of ceramic matrix composites alongside C/SiC, SiC/SiC, etc. Compared with non-oxide ceramic matrix composites, Al2O3/Al2O3 possess unique advantages such as long-term oxidation resistance, high-temperature corrosion resistance and low cost etc, and display broad application prospects in the field of military and civilian thermal structural materials such as aircraft engines and gas turbines. This paper focuses on the research process of porous matrix Al2O3/Al2O3 (P-Al2O3/Al2O3), especially the engineering applications in recent years, and has reference significance for the future development of Al2O3/Al2O3 system in domestic. Finally, the key problems and the future development proposals of P-Al2O3/Al2O3 are summarized.