Ti₃SiC₂, a layered ternary compound material combining the ceramic and metal properties, is considered one of candidate materials in nuclear industry. However, the problems of hydrogen embrittlement commonly existing in metals have not been investigated yet. Using the first-principles calculation, we investigated the effect of hydrogen on the cleavage characteristics of Ti₃SiC₂. It was found that cleavage fracturing inherent in Ti₃SiC₂ is not aggravated because the chain of Ti2–C–Ti1–C–Ti2–Si as a constructing unit of the crystal remains intact when hydrogen presented. The mechanical response of Ti₃SiC₂ to hydrogen is different from metals in nature.