Feature event synthesis and ballistic fusion are the most important tasks in the process of space launch.The flight status of a launch vehicle can be intuitively reflected through the occurrence time of feature event and its flight ballistic trajectory.In order to further improve the effectiveness of feature event synthesis and ballistic fusion，based on the remote and external measurement information，the information sources involved in the feature event synthesis and ballistic fusion are classified，their influence factors are analyzed，and the corresponding information fusion strategies are proposed.By adopting an improved fusion strategy，the accuracy and effectiveness of the feature event time calculation is further improved，and the ballistic fusion results are improved enough to meet the requirements of status display and safety control missions during the space launch flight.