Abstract: The system of laser wake detection is a laser-electric compound one. It can detect and trace wake bubbles based on the differences of light absorbing and scattering between pure seawater and the seawater containing bubble wake. The interfe rences with the laser wake detec tion system are both optic and electronic, mainly including laser power fluctuant , light scattering on particles in water, natural light and electrical circuit. According to the analysis of the interferences with the system performance, this paper uses adaptive algorithm to restrain the laser power fluctuation and the light scattering on particles in water, applies filter slice and signal processing algorithm to restrain the interference of natural light, and adopts power filter and covering ground technique to reduce the interference from electrical circuit. The experimental results demonstrate the improved performance and stability o f the laser wake detection. system.