Abstract: For the multi-objective optimization of the composites stiffened panel structure of sonar dome, the insertion losses of different panel structures are tested in anechoic tank. Near field sound transmission characteristics of steel truss and other four types of composites stiffened panels are compared and analyzed. The effects of rib material, rib form and incidence angle are discussed. The test and analysis results show that the near field sound transmission characteristics of the truss stiffened panel is excellent and stable. The thin and short rib stiffened panel can improve the overall sound transmission characteristics. The results of the study provide a reference for the optimized design of the stiffened panel structure of sonar dome.