There have been increasing needs for high-thermal stability and high-electrical conductivity materials. In this study, we in situ synthesized silicon oxycarbide (SiOC)-TiC (x) O (y) composites based on the pyrolysis of polysiloxane and carbothermal reaction between TiO2 nanoparticles and free carbon in SiOC. The TiO2 to TiC (x) O (y) conversion is dependent on the pyrolysis temperature. Higher pyrolysis temperature leads to more TiC formation but lower thermal stability. With more homogeneous distribution of TiO2, the thermal stability of the SiOC-TiC (x) O (y) composite increases. This family of SiOC composite also demonstrates high electrical conductivity. The highest electrical conductivity is 5.03 S cm(-1) at 400 A degrees C measurement temperature, the highest for air atmosphere condition. The key issue for tuning the SiOC-TiC (x) O (y) system for both thermal stability and electrical conductivity is to avoid the destabilization of the SiOC system.