Three 532 nm pulsed lasers with different pulse width 30 ps, 100 ns and 4 ns and the same repetition frequency of 1 kHz are used to radiate CCD. The whole phenomena from linear responding, image element saturation, saturation cross talk and damage are observed. The thresholds of saturation and damage are obtained. Experimental results show that the jamming effect induced by picosecond pulse sequence laser is better than that of ordinary picosecond pulse laser, and the power density of picosecond pulse sequence laser is lower than that of picosecond pulse laser for 1~2 orders of magnitude while the same jamming effect is obtained.