Abstract: In our experiment, polycrystalline silicon detector was irradiated by 10.6 m continuous-wave(CW)CO2 laser, and the saturated threshold and damage thresholds were determined, the achieved saturation threshold and damage threshold were 5.5510-4 W/cm2 and 0.48 W/cm2, respectively. The jamming effectiveness and damage mechanism on polycrystalline silicon detector of different laser power densities and different laser irradiation time were analyzed, and according to the jamming degree of detector, the interference hierarchy was classified as 4 grades, such as point saturation, moderate saturation, severe saturation and point damage .Additional, based on the relationship between the interference laser power and the interference light spot area, the relational expression of power function y=76.3x0.29 was got, and finally according to this, the jamming effect of 10.6 m pulse laser on infrared imaging system was discussed.