The spiral fluidity of Al-xSi/ySiC (x:6∼18 wt.%, y:3∼9 wt.%, particle size:l0∼28 ㎛) composites melt was investigated in this study. Addition of SiC particles to the base alloy decreased the fluidity of the Al-Si/SiC_p composites melt. The spiral fluidity (F) of the Al-Si/SiC_p composites melt was influenced more directly by the surface area of the SiC particles (S) dispersed in the molten AI-Si alloy, rather than the volume fraction or size of SiC particles and this could be expressed by following empirical regression equations. F=27.269-0.011S (pouring temp.: 750˚C) at AI-6wt.%Si/SiC_p, F=41.635-0.019S (pouring temp.: 750˚C) at Al-18wt.%Si/SiC_p. The spiral fluidity of hypereutectic Al-Si/SiC_p composites melt increased with increaes in pouring temperature of the melt. However, the spiral fluidity of hypereutectic AI-Si/SiC_p composites melt did not increase significantly when the pouring temperature was increased above 780˚C (Received December 1, 1997)