Titanium matrix composites (TMCs) offer much improved strength, elastic modulus, and wear resistance at both room and elevated temperatures, meeting the increasing demand for high-performance light-weight structural materials. In this work, we developed a powder conditioning process that involves coating polycarbosilane (PCS) on Ti particles. After sintering, the conditioned Ti powder was converted into Ti composites. TiC was derived from the pyrolysis of PCS and forming an in-situ reinforcement. The average grain size of α-Ti decreases significantly from 100.5 μm in pure Ti to 16.1 μm in the Ti-3 wt.% PCS composite. Among these Ti composites, the 3 wt.% PCS sample exhibits a high room temperature tensile strength of 861 MPa, high yield strength of 754 MPa and reasonably large elongation of 10.8%, respectively. This work would shed light on the design of low-cost and high-performance material with in-situ reinforcement.