The invention discloses a storage method of file data in a file bank system, comprising: arranging a tree-type hierarchical structure for describing the file data; determining storage granularity of the file data in a file bank system, and dismantling the file data in the file bank system into fragment data according to the storage granularity; according to the hierarchical structure of the set file bank system, determining and storing the hierarchical structure, and storing the dismantled fragment data in corresponding hierarchical structure. Therefore, the file data in the file bank are dismantled into the thinner fragment data and stored. In this way, when a user searches or visits the file data, the user can fast and correctly position level of the stored granularity, performs data search and content extract flexibly and with high efficiency, thereby reducing load in file transmission process for the file application based on the network.