Abstract: The correlation sonar for velocity measurements (i.e. the correlation velocity log system) obtains the velocity of vessel and other information by using model-matching of the correlation function of echo data with the theoretical correlation function. The main lobe width of the spatial correlation of sea-bottom backscattering influences the accuracy of the vessel velocity estimation. Therefore, it is greatly important to research the spatial correlation of sea-bottom backscattering for correlation sonar. Based on the characteristics of correlation sonar, the MVC design pattern is pro-posed to build the simulation system of sea-bottom backscattering for correlation sonar, and the simulation software is implemented on the VC 6.0 software development platform. Establishing a friendly system of visual communication interface, the simulation software provides a convenient platform for the research on bottom reverberation simulation.