Weapon system requires large amounts of data during the process of test,training and combat.At the same time,a large amount of data will be generated.The tight hinges of these data support the operation of the weapon system,which is the important foundation for modern networked combat.The data characteristics of weapon system are studied.And the data management method based on three-tier system is proposed.The data are stratified into three levels according to the characteristics of the data structure,retrieval frequency,and update frequency.These data are managed by different storage technology and platform.The data transformation relationship among the three layers is also described.Finally,some application results are listed.