Morphology and growing direction of TiC in titanium alloy has been investigated by gravity and directional solidification technique. No equilibrium crystalline morphology of TiC is dendritic shape and it has also been observed that. TiC crystal grows in the direction of [110] in some special situation. An analysis of the results indicates that the first preferentially growing direction is direction of <100>, and the second is of <110>. When the growing direction of <100> is suppressed, direction of <110> will be the preferentially growing direction. Dendritic arm spacing models are put forward, which explains the reason why the direction of <100> is one of the preferentially growing directions.