The output signal and out-of-service time of the PC type HgCdTe detectors are obtained when irradiated with femtosecond laser at the repetition rate of 1 kHz, and repetition rate of 10 Hz, respectively. When irradiated with the 1 kHz repetition rate femtosecond laser at the fluence of 0.024 mJ/cm2, the output signal is distorted and the reference signal can be perceived, and the reference signal vanished, the detector disabled when the laser fluence increased to 0.60 mJ/cm2. While irradiated with the femtosecond laser of 10 Hz repetition rate, the out-of-service time of the detector was increasing with the irradiated fluence and the out-of-service time of 520 μs is obtained at the fluence of 2.03 mJ/cm2. The output signal indicates that the temperature of the detector is ascending while irradiated with femtosecond laser pulses continuously, which results in the resistance increasing.