Abstract: The information detection and weld seam tracing system is analyzed on the high-pressure water environment rotating arc welding hardware platform,and the system transfer function and discrete state equation is obtained. Based on the discrete state equation,the fuzzy and fuzzy sliding mode controller is used to trace the step signal with noise; the result shows that fuzzy sliding mode controller is very good at antijamming. By using the suitable fuzzy sliding mode controller design,the seam tracking experiment is done in the high-pressure water environment. The theoretical analysis and experimental results show that fuzzy sliding mode controller used in rotating arc welding seam tracking in high-pressure water environment is effective.