This paper firstly analyzes and compares the advantages and disadvantages of the several storage systems, then according to the characteristics of spatial data services in grid environment, the choice of a storage system: storage system based on object. On this basis, this paper proposes the construction rules of spatial data storage system under grid environment, and according to this rule, establish the spatial data storage system formed by spatial data storage server, metadata directory server and server load balancing, the related algorithms are described in detail, finally, test and verify the system.