Abstract: In the context of information warfare, a comprehensive and accurate understanding of the battlefield situation is the key for commanders to make correct decisions. Situation generation refers to the estimation, understanding, and prediction of the situation based on the perception of battlefield elements, and forming situation products that meet operational needs. It plays an important role in the entire combat process, including detection, tracking, identification, strike, and evaluation. An overview of situation generation technology for sea battlefield is made in this paper. Firstly, the development process of situation generation is introduced, including the origin of concepts of situation generation, the evolution of basic models and the application of typical projects. Then, the understanding of the connotation of situation generation is elaborated, and the typical characteristics that high-quality situational generation should possess are extracted and the key technologies involved in each stage of situation generation are analyzed, including resource scheduling, detection and perception, data fusion, target recognition, threat assessment, situation analysis and product distribution. Finally, the future development direction of situation generation technology is discussed.