Polytitanocarbosilane(PTC)，the precursors of SiC fibers containing，Ti，was synthesized by the reaction between polycarbosilane (PC) and tetrabutoxititanium (Ti(OBu)₄). The structure and properties of PTC depend directly on the molar ratio of Ti(OBu)₄/PC. The spinnability and the melting point of PTC change regularly with this ratio. It is attributed to the formation of the crosslinked structure by-Ti-O-as bridge group and the pendant structure by-Ti(OBu)₃ as side group. The relation between structure and properties of PTC has been studied in this paper. SiC fiber containing Ti has been obtained from PTC-0.02 and PTC-0.04 with good spinnability as their precursors.