This paper addresses an experimental study to make clear the effect of thermal shock on the interlaminar shearing strength of woven C/C composites. Rapid heating and cooling was realized by introducing high-frequent induction heating system. A short beam test was applied to evaluate the interlaminar shearing strength. Under the condition of the present test, the ILSS value decreased about 20% due to the thermal shock. By a series of tests varying the span-to-thickness ratio, a desirable span-to-thickness ratio was found to be 7~10 to realize the interlaminar shearing failure of laminated C/C composites. Damage mechanism was also discussed with the aid of fractography.