The application of data fusion technology in Navy Unmanned Aerial Vehicle (NUAV) for reconnaissance,detection and target indication process is studied,and a track fusion algorithm for marine target is proposed.The track fusion of airborne sensors in target detection is implemented through such processes as time/space alignment,data association,track synthesis,track file management,and fusion tracking filtering.Thus the unified battlefield situation information and high-precision target indicating information can be obtained,which provides a strong information support for battlefield situation awareness and target attacking.The simulation results show that the algorithm is valid and has high engineering application value.