Abstract: Underwater ambient pressure has negative effect on metal transfer and welding processing stability, so extra force is needed to help to stabilize welding arc and improve metal transfer state during underwater welding. To verify the feasibility of laser which enhanced metal transfer control, the related experiment system was built at atmospheric pressure, and contrastive study on metal transfer state with and without laser enhanced was conducted. Results showed that the application of a certain power density of laser could improve metal transfer behavior obviously and the size of droplet could be controlled by laser, the welding stability also could be improved. The result laid a foundation for the further laser enhanced hyperbaric underwater welding experiment.