The connotation and the important role of underwater operational experiment simulation are presented at first.And the technical requirements are discussed from two views of applications which include underwater information conflict fine simulation and high performance computing of complex sonar system .The relative status quos at home and abroad are introduced subsequently. Then, the scientific problems that need to be studied in the simulation of complex sonar system in signal level underwater warefare experiments are analyzed. Three noteworthy technologies of the current researches in two important scientific problems,which involve underwater broadband signal simulation modeling technology, and signal-level sonar simulation modeling technology based on high performance computing platform & control strategy of signal-level simulation are proposed. Each proposal is comprised of research contents and research results. Finally,some conclusions and further research directions are given.