The interference of marine environment and vessel by decoys cannot be neglected in the complicated marine background. The characteristics of infrared decoys were indicated based on its spatial and temporal distribution characteristics and infrared radiation model. According to the mechanism of radiation energy from decoys and the marine environment, the marine surface scattering model was built based on bidirectional reflectance distribution function(BRDF). A GPU-based parallel computing framework of marine interference scens with infrared decoys was designed, and a 3D real-time simulation of interference of compliected marine scene was performed before and after marine-/aerial-decoys launch. The influence on the imaging by marine-/aerial-decoys established, and the vessel contrast variation with decoys launch angle and observing height were analyzed. The research provides the basis for the study of marine objectives detection algorithms and decoy development.