Abstract: Based on range-gate principle, a Nd∶YAG laser, whose frequency was doubled to yield a wavelength of 532 nm, was used as the light source, and rangegated Integrated Circuit Card Device(ICCD) system was used as the receiver. The experiment with range-gated method was conducted in 8 m depth water with diffuse attenuation coefficient k0.45. Maximum underwater detection depth of 7 m and 10 ns image gate were achieved. The experimental results show that the range-gated imaging method is a rapid and effective technology for underwater object detection and reorganization.