As to the evaluation demonstration problem for radar detection performance in marine environment, the simulation evaluation system is designed and implemented based on the radio propagation models and radar detection performance models, which is researched with the acquisition and processing methods of environment data and selection criteria for different evaluation models. The functions of information processing, environment parameter input, characteristic database query and setting, equipment performance evaluation and operation assistant decision have been designed in this system.The theoretical basis and technical support are supported to the battlefield preparation and right strategic decision of commanders.