Through simplifying the architecture of hierarchical storage system, this paper puts forward a hierarchical storage system FQ-HSM based on file queue. Based on the FVAP（File Value Accurate Prediction）, FQ-HSM calculates the system relative values of files and builds file queue, then it decides the data migration plan through storage early warning mechanism. After testing FQ-HSM, the results show that it has had due functions: data classifying, data automatically migrating, user transparently accessing and so on. FQ-HSM shows a good performance compared with present data classifying methods in hit rate and back-migration rate.
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