Abstract: Subjectto uncertain engagement circumstance, the information incompleteness of sonar is examined, and the probabilistic modeling of target maneuvering, the statistic optimization of sonar contact, and a fast cycle of detectiondecision are proposed. Discussion about the changes of oceanic environment, the dynamic reconstruction of acoustic calculation and diversity expression of calculated results,a proposal about the scale-free sonar system design and the self-organization of models is made. Due to data increment on sonar learning, the sustainable model training which run at an open system architecture associated with data engineering is argued. The human factors in sonar which is man-machine system are analyzed, so as to make consideration of the subjectivity in sonar training and combat game.Comprehensively, the generalized connotations of a new sonar system are defined.