Under the irradiation of the 10.6μm CO2 laser at various energy density, the output signal of PC-type HgCdTe detectors has been studied, and the damage thresholds are determined. In the mean time, damage thresholds of detector irradiated by laser were calculated by using one dimension semi-infinite solid model. The calculation was compared with the experiment result, and the possible reason of the error is not only the different material property of detector, but also the detector’s technics and the laser b...