The creep behavior and failure mechanism of the 30 vol% hot-pressed SiC_f/Si₃N₄ ceramic composite was experimentally investigated at 1200℃ and at various stress levels in air. The creep threshold stress for zero creep rate after 100 hr was found to be approximately 60㎫. The stress exponent was estimated to be n∼1, which suggests that fiber-reinforcement reduced the stress sensitivity of the HPSN matrix with the stress exponent of 2. The tertiary stage leading to creep rupture was found at 250㎫ but was very short. The microstructure of the crept specimen showed random fiber fracture and no matrix cracking. Interfacial debonding was absent.