Abstract: The seabed topography has an important influence on the acoustic stealth of seabed targets. Effectively evaluating the probability of detection for seabed target deployment areas is one of the basic elements for selecting the best deployment points. From the perspective of using the unique topographic environment of seamounts to reduce the probability of seabed targets being detected by active detection, this paper simulates and calculates the three-dimensional sound ray structure, sound transmission loss, seabed reverberation clutter, and the distribution pattern of sound shadow areas under the influence of seamounts. A method for evaluating the site selection of seabed targets based on the detection probability grid is proposed, which uses the active sonar equation, statistical detection theory, and route shortcut model to calculate the probability of seabed target detection, combined with hierarchical gridding of the seabed area. The simulation experiments are carried out using actual seabed terrain data, the simulation results show that the probability of detection in the top area of the seamount slope is about 60.0%, the probability of detection in the bottom area of the seamount slope is about 70.0%, and the probability of detection in the high-altitude area around the seamount is about 65%. The model can realize the quantitative analysis and visualization of the detection probability of the seabed target area and support the prediction of hidden site selection for seabed targets.