TiC can be divided into two kinds of primary TiC and eutectic TiC in the Ti matrix composites reinforced with in situ particles. The morphology, size and forming mechanism of the primary TiC differ from the and eutectic TiC, In this paper, the forming process and morphologies of the eutectic TiC in Ti alloys were studied by using of SEM, XRD and EDS. For different C contents in the Ti C alloy, regular eutectic TiC or divorced eutectic TiC can exist. In the alloy with a composition near the eutectic point of Ti C alloy, the TiC morphology is rod shape and particle shape due to the co growth of two phases β Ti and TiC and the suppression of β Ti dendrite. When the C content in Ti C alloy is lower than the eutectic point greatly, the alloy forms the divorced eutectic between β Ti dendrites growing and clung to the primary β Ti. Although the TiC tends to the branch during growing, the β Ti dendrites restrain the free growth only in two dimensions and with feather shape for the TiC dendrite. The feather shaped TiC can be changed to be spherical shape by adding of elements, such as Mo and Sn.