Active imaging detection using laser is becoming more and more important in exploring ocean. The sea surface is a complex refraction system that can influence the crossing media detection of underwater objects complicatedly. This paper first take Gerstner wave as object to make an analysis in mechanism so as to find the influence of waving sea surface to light.It is concluded that only the incident angle is quiet big,which means light incoming to the small area near the wave crest,the refraction of the sea surface will have a great influence on the detection. Then the simulated sea surface based on Statistical Wave Model using Phillips Spectrum was formed and the statistics of incident angles in each point of model was made,finding that most of angles are small. Then specific deflections of rays at every point in simulated surface are shown. At last imaging simulation is shown and evaluated by the structure similarity theory (SSIM). The research results indicating that waving sea surface can cause little disturbance in detection and decay the amplitude evenly,which is not as complicated as water surface showing. Image quality will decrease exponentially with state of sea scale increase.