The field experiment of color CCD camera in automatic mode jammed by RGB laser and single color laser has been carried out. The theoretical analysis and experimental results show that higher power laser will result in crosstalk phenomenon on the CCD camera screen. Long time strong laser radiation results in permanent damage of CCD pixels and full saturation of CCD camera screen. Under the same experimental conditions,the RGB laser is easier than single color laser to make full saturated images,but single color laser can obtain similar full channel jamming effect when its power is up to 10 times of RGB laser power. The different backgrounds have significant effect on the jamming efficiency. RGB background is more difficult than single color background to obtain good jamming effect.