Abstract: In order to fulfill the file accessing and sharing requirements in a grid environment, an owner-centric grid file sharing mechanism is proposed. The main idea of this mechanism is the division of resource ownership. By dividing resource ownership into logic ownership and physical ownership, the task of resource management is partaken by multiple resource owners. By global user identity, tight binding and consistent authorization, resource owners can have maximal discretionary control of resource accessing and delegation transfer. Based on this mechanism, a grid-level file system prototype called VegaFS is designed and implemented. Users of VegaFS can slip the leash of administrative domains, consistently accessing the files distributed in different administrative domains.