Multi-sensor information fusion technology is a process of carrying on comprehensive processing of the observed data of each sensor，and is a high level generic key technology in multi-discipline and multi-field. Based on multi-source information fusion technology，the further study on multi-source detection information fusion algorithm of AIS，radar and sonar is conducted in this paper，and the engineering application scheme of multi-source information fusion and alarm technology adapted to underwater security system is proposed. Meanwhile a brief summary is given on actual applications, and it is proved that this technology can be well used in data analysis and classification alarm of underwater security system.
