Abstract: Aiming at the problem that most existing studies on underwater range-gated laser imaging focus on static targets and can hardly meet the engineering requirements of high-precision detection and multi-parameter measurement of underwater moving targets, an experimental study on underwater range-gated laser imaging of moving targets is carried out. A nanosecond synchronous underwater range-gated laser imaging system with both continuous and intermittent dual operating modes is developed, and a multi-scenario experimental platform is constructed. Systematic experiments are conducted, including imaging of static targets in a swimming pool, dynamic imaging of simulated projectile motion and deployment of projectile fins and rudder wings in a laboratory water tank, and binocular intersection three-dimensional reconstruction in offshore waters at a dock. The results show that the system achieves clear imaging of static targets at a distance of 50 m in water with an attenuation coefficient of 0.201 m⁻¹, accurately obtains the motion trajectory, velocity attenuation characteristics of simulated projectiles and the time sequence parameters of projectile fin and rudder wing deployment, and completes three-dimensional reconstruction and attitude calculation of moving targets. The system can effectively realize high-resolution imaging and parameter measurement of underwater moving targets, providing reliable technical support for underwater dynamic target detection and characteristic testing.