Abstract: Researches on the selection of mat rix and reinforcement , fabrication methods , microst ructure , interfacial , oxidation behavior , and mechanical properties of in si tu reinforced titanium mat rix composites are reviewed.The processing of in situ synthesized composites by reactive hot pressing (RHP) is int roduced in detail according tothe authors’ research , and the mechanical properties and microst ructure of the composites are analyzed respectively.The review concludes with bringing forward the problems and proposing the potential development trends of the composites.