The SiCw/6061Al Composite was fabricated by using ${eta}-SiC$ whisker as the reinforcement and the commercial 6061 aluminum alloy as the matrix. Squeeze casting technique was for fabricating the composite with the whisker volume fraction of 31%. The SiCw/6061Al compsites were divided into three groups : the first is in as cast state ; the second is in T6 state ; and the third is in deep cooled state. The coefficient of thermal expansion (CTE) of the 6061Al and SiCw/6061Al composites in different states were measured at temperatures rom $100^{circ}C$ to $500^{circ}C$. The experimental results showed that the coefficient of thermal expansion of both 6061Al and SiCw/6061Al composites increases with increasing temperature. In the lower temperature range, the coefficient of thermal expansion of the SiCw/6061Al composite is obviously lower than that of the 6061Al. but because of the higher rate of the increment of CTE of the composite, the value of CTE of the composite, the value CTE of the compostie becomes almost equal to that of the 6061Al after the temperature is higher than $400^{circ}C$. The results also indicated that, at th lower temperature range, the CTE of the T6 state composite is lower than that of the as-cast composite, and the deep cooled composite showed the lowes CTE.